The science behind some of the most incredible engineering accidents ever filmed is revealed; a look at the physics involved as well as forensic details to explain the slip-ups that turned construction into destruction.

Examine how seismic activity exposed WW II vessels near Iwo Jima; unravel clues to Maya political intrigue in Guatemala; see why footprints found post-storm are changing English migration history; visit a Neolithic wall on an eroding Scottish coast.

Guest comic Maile Brady.

Guest comic Jeff Davis.

Super Typhoon Yolanda - the biggest ever recorded- destroys swathes of the Philippines; a huge falling glacier in Greenland unleashes a tsunami-like wave; Houston is sunk underwater by a massive flood that almost drowns a herd of horses.

Decoding the secrets of long-lost human settlements; scrutinizing a mysterious Norwegian mound, a prehistoric stone circle on the banks of the Tagus River, a lost city in the cradle of civilization and bizarre rock shapes.

Experts uncover four global stories of extraordinary curiosities that were once concealed in the deserts of the planet.

A British Air Force officer is stunned when a cylindrical object sends a beam of light toward him; school children witness multiple UFO sightings over a three-day period.

Most accounts of UFO sightings can be explained by and attributed to normal earthly phenomena. Those that cannot be solved, however, have police investigators, government officials and researchers puzzled, even decades later in some cases. In each episode of "Close Encounters," two stories of alien phenomena around the world are investigated, re-created and reviewed by researchers. In the telling of each one, the program reveals to viewers facts about thousands of reported occurrences.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Contestants compete across the series, scoring points by answering questions correctly; they must avoid the impossible answers, otherwise they will be eliminated until the next day.

A remote island linked to one of the world's most famous aviation mysteries; thousands of shipwrecks in the Bermuda triangle; a history lost and found in the South Pacific; a 10,000-year-old mystery in the murky depths of the Yucatan Peninsula.

Scan the skeleton of a drowned Stone Age fisherman in Chile and rediscover a vanished golden age in Egypt's lost city of Aten; ancient Chinese mummies reignite a cultural debate; discover a massive biblical-era moat in Jerusalem.

When seen from above, the pyramids of Giza align with the stars; survivors of Katrina find rescue when least expected; a volcano burns bright blue; a forgotten beach reveals its secrets.

Squaring off on national parks, Downton Abbey, musical theatre and human anatomy.

Games include: Questions, Doo Wop, Dubbing, Scenes from a hat, Helping hands.

Guest comic Greg Proops.

Zoom in on some otherworldly sights; spot a giant glacier on the Red Planet, let the milky seas off the coast of Java bathe your vision, ponder a huge hexagon floating above Saturn and take a spin around a doughnut-shaped lake in Saskatchewan.

Exploring an ancient Egyptian cemetery filled with everyday people and find links to historic weaponry in a horseshoe-shaped French monument; puzzle over a lost South Asian society, then see if human remains found in Wales hint at coastal rituals.

Two devastating earthquakes hit Mexico in quick succession; a maverick traveler sees a volcano blow up in his face in Guatemala; a storm junkie risks his neck.

Scan the skeleton of a drowned Stone Age fisherman in Chile and rediscover a vanished golden age in Egypt's lost city of Aten; ancient Chinese mummies reignite a cultural debate; discover a massive biblical-era moat in Jerusalem.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Games include: Questions, Doo Wop, Dubbing, Scenes from a hat, Helping hands.

Guest comic Greg Proops.

A remote island linked to one of the world's most famous aviation mysteries; thousands of shipwrecks in the Bermuda triangle; a history lost and found in the South Pacific; a 10,000-year-old mystery in the murky depths of the Yucatan Peninsula.

A cat named Kiki is in a bad way after a fight on the farm, and a rescue puppy named Gemma shocks the clinic during ear surgery; Jerry the goat will starve unless Dr. Poitras can figure out why he's not eating properly.

Justin Moorhouse, Emmanuel Sonubi and Holly Walsh join.

Sandi Toksvig is joined by Maisie Adam, Daliso Chaponda, Jack Dee and Alan Davies for a look at some underthings.

Sandi Toksvig goes to university with Guz Khan, Joe Lycett, Morgana Robinson and Alan Davies.

Alaska is a challenging place, but tenacity of the spirit makes it home.

A cat named Kiki is in a bad way after a fight on the farm, and a rescue puppy named Gemma shocks the clinic during ear surgery; Jerry the goat will starve unless Dr. Poitras can figure out why he's not eating properly.

Sandi Toksvig takes a look at upbringing with Sally Phillips, Josh Pugh, Aaron Simmonds and Alan Davies.

Sandi Toksvig is joined by Maisie Adam, Daliso Chaponda, Jack Dee and Alan Davies for a look at some underthings.

Sandi Toksvig goes to university with Guz Khan, Joe Lycett, Morgana Robinson and Alan Davies.

Games include: Questions, Doo Wop, Dubbing, Scenes from a hat, Helping hands.

Guest comic Greg Proops.

Two devastating earthquakes hit Mexico in quick succession; a maverick traveler sees a volcano blow up in his face in Guatemala; a storm junkie risks his neck.

Zoom in on some otherworldly sights; spot a giant glacier on the Red Planet, let the milky seas off the coast of Java bathe your vision, ponder a huge hexagon floating above Saturn and take a spin around a doughnut-shaped lake in Saskatchewan.

Scan the skeleton of a drowned Stone Age fisherman in Chile and rediscover a vanished golden age in Egypt's lost city of Aten; ancient Chinese mummies reignite a cultural debate; discover a massive biblical-era moat in Jerusalem.

When seen from above, the pyramids of Giza align with the stars; survivors of Katrina find rescue when least expected; a volcano burns bright blue; a forgotten beach reveals its secrets.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Just after shuttering many businesses in response to the pandemic, Jonesboro, Ark., takes another hit from a natural disaster; an EF3 tornado touches down on the south side of the city and plows across the busiest parts of Jonesboro.

Strange aquatic mammals populating a river in Columbia; a ship marooned in a sea of sand along Namibia's notorious Skeleton Coast; a Boeing 727 jetliner hidden in a pine forest; an unusual pattern is discovered in the Nevada desert.

Experts uncover four global stories of extraordinary curiosities that were once concealed in the deserts of the planet.

In the summer of 1952, stories of U.S. Air Force jets chasing UFOs over the White House knock the Korean War off the front pages of newspapers; as rumors spread, President Harry S. Truman demands to know what was flying over his house.

Contestants compete across the series, scoring points by answering questions correctly; they must avoid the impossible answers, otherwise they will be eliminated until the next day.

Guest comic Mark Ballas.

Guest comic Gary Anthony Williams.

Explores strongholds abandoned by their architects; a lost city in the Amazon jungle; a desert fortress made by humanity's most notorious empire; explores a city of identical castles; examines a Greek isle's bloody history from the air.

Experts uncover four global stories of extraordinary curiosities that were once concealed in the deserts of the planet.

A rare tornado decimates a small town in rural Uruguay, snaring a man in his car and obliterating a huge warehouse; a thrill seeker fulfills his ambition to reach the world's largest lava lake.

Experts uncover four global stories of extraordinary curiosities that were once concealed in the deserts of the planet.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Guest comic Mark Ballas.

Guest comic Gary Anthony Williams.

Strange aquatic mammals populating a river in Columbia; a ship marooned in a sea of sand along Namibia's notorious Skeleton Coast; a Boeing 727 jetliner hidden in a pine forest; an unusual pattern is discovered in the Nevada desert.

The investigation of some of the most notorious and mysterious events, in an attempt to unravel all the possible reasons for the disasters.

Visit a strange wood-lined tunnel beneath a Copenhagen train station. Locate one of North America's earliest schools for Black children in Virginia, excavate a warrior cemetery in Finland, and unearth a women-only burial plot beneath a Welsh castle.

Explores strongholds abandoned by their architects; a lost city in the Amazon jungle; a desert fortress made by humanity's most notorious empire; explores a city of identical castles; examines a Greek isle's bloody history from the air.

The investigation of some of the most notorious and mysterious events, in an attempt to unravel all the possible reasons for the disasters.

Visit a strange wood-lined tunnel beneath a Copenhagen train station. Locate one of North America's earliest schools for Black children in Virginia, excavate a warrior cemetery in Finland, and unearth a women-only burial plot beneath a Welsh castle.

Guest comic Mark Ballas.

Guest comic Gary Anthony Williams.

A rare tornado decimates a small town in rural Uruguay, snaring a man in his car and obliterating a huge warehouse; a thrill seeker fulfills his ambition to reach the world's largest lava lake.

Explores strongholds abandoned by their architects; a lost city in the Amazon jungle; a desert fortress made by humanity's most notorious empire; explores a city of identical castles; examines a Greek isle's bloody history from the air.

Experts uncover four global stories of extraordinary curiosities that were once concealed in the deserts of the planet.

In the summer of 1952, stories of U.S. Air Force jets chasing UFOs over the White House knock the Korean War off the front pages of newspapers; as rumors spread, President Harry S. Truman demands to know what was flying over his house.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

The Goggleboxers share their thoughts on "The Celebrity Traitors," "Love Is Blind," "Coronation Street," "The Girlfriend," "Nightmares of Nature," "The Reluctant Traveller" and "Yorkshire Air 999.".

An enormous fiery vortex in Redding, Calif.; the island nation of Malta loses a natural treasure; a mysterious radioactive hotspot is discovered near Chernobyl; an unknown force lays waste to a mountain forest in Italian Alps.

Experts uncover four global stories of extraordinary curiosities that were once concealed in the deserts of the planet.

A surge of sightings in Colares, Brazil in 1977 causes major panic and thousands of people leave the island as a result; On a dairy farm in Australia, a mysterious flying object causes a brutal headache for the farmer.

Officials have to decide how to confront a large, unidentified object hovering over one of America's most secure Air Force bases; a priest communicates with four beings on a saucer-shaped metallic craft in Papua, New Guinea.

Contestants compete across the series, scoring points by answering questions correctly; they must avoid the impossible answers, otherwise they will be eliminated until the next day.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

Peek at landmarks in places where they shouldn't be; wing your way over an imperial pyramid in the Netherlands, a metal sphere in remote Russia, a lion shape carved into an English hillside and a bare swath cut through an Austrian forest.

Experts uncover four global stories of extraordinary curiosities that were once concealed in the deserts of the planet.

In South Africa, the Cape is struck by both a violent storm and catastrophic wildfires that overwhelm the emergency services.

Experts uncover four global stories of extraordinary curiosities that were once concealed in the deserts of the planet.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

An enormous fiery vortex in Redding, Calif.; the island nation of Malta loses a natural treasure; a mysterious radioactive hotspot is discovered near Chernobyl; an unknown force lays waste to a mountain forest in Italian Alps.

A secret military base around the North Pole; a man-made, ancient stone formation below the surface of Lake Huron; a 1500-year-old burial ground on the shores of the Baltic Sea; a life form in the permafrost in Russia's far east.

On the island of Madagascar, paleontologists discover an intact fossil unlike any known animal, living or extinct; bizarre stone spheres are discovered in Costa Rica; the curious remains of a small man are found in Chiapas, Mexico.

Exploring an ancient Egyptian cemetery filled with everyday people and find links to historic weaponry in a horseshoe-shaped French monument; puzzle over a lost South Asian society, then see if human remains found in Wales hint at coastal rituals.

A secret military base around the North Pole; a man-made, ancient stone formation below the surface of Lake Huron; a 1500-year-old burial ground on the shores of the Baltic Sea; a life form in the permafrost in Russia's far east.

On the island of Madagascar, paleontologists discover an intact fossil unlike any known animal, living or extinct; bizarre stone spheres are discovered in Costa Rica; the curious remains of a small man are found in Chiapas, Mexico.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

In South Africa, the Cape is struck by both a violent storm and catastrophic wildfires that overwhelm the emergency services.

Peek at landmarks in places where they shouldn't be; wing your way over an imperial pyramid in the Netherlands, a metal sphere in remote Russia, a lion shape carved into an English hillside and a bare swath cut through an Austrian forest.

The Avenue of the Sphinxes has now been unearthed in the biggest excavation in Egyptian history; using cutting-edge CGI, investigators reveal the hidden secrets of the sphinxes.

A surge of sightings in Colares, Brazil in 1977 causes major panic and thousands of people leave the island as a result; On a dairy farm in Australia, a mysterious flying object causes a brutal headache for the farmer.

Officials have to decide how to confront a large, unidentified object hovering over one of America's most secure Air Force bases; a priest communicates with four beings on a saucer-shaped metallic craft in Papua, New Guinea.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

As seen from space, a crater in Turkmenistan, is on fire; drones reveal perfect circles in the Namibian desert; A puzzle is solved by a World War 2 code breaker; Mystery of Death Valley's self-moving stones; Utah's strange electric blue ponds.

A long-forgotten network of Native American earthworks; a baffling battlefield mystery in Belgium; a mysterious blood-red lake on a remote Greek island; an eerie pink glow emulating from the middle of the Pacific Ocean.

Experts uncover four global stories of extraordinary curiosities that were once concealed in the deserts of the planet.

Mind games begin and paranoia sets in, as the Yorkshire girls, Anna and Elizabeth, become increasingly spooked, and Ayo and Madu part company.

Rick reveals a fresh slate of answers, some of which can't possibly be right.

Games include: Questions, Doo Wop, Dubbing, Scenes from a hat, Helping hands.

Guest comic Greg Proops.

Examine strange relics forgotten by time; visit a perturbing circle of stone in the Golan Heights; a mountain of headless statues in Turkey; a castle left to crumble in the Saudi Arabian desert; a time-worn secret in the wilds of Peru.

Scan the skeleton of a drowned Stone Age fisherman in Chile and rediscover a vanished golden age in Egypt's lost city of Aten; ancient Chinese mummies reignite a cultural debate; discover a massive biblical-era moat in Jerusalem.

A hiker in a remote Canadian wilderness clings on for dear life as a glacial melt flash flood threatens to sweep him away.

Experts uncover four global stories of extraordinary curiosities that were once concealed in the deserts of the planet.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Guest comic Maile Brady.

Guest comic Jeff Davis.

A long-forgotten network of Native American earthworks; a baffling battlefield mystery in Belgium; a mysterious blood-red lake on a remote Greek island; an eerie pink glow emulating from the middle of the Pacific Ocean.

Celebrity guests discuss their current projects and the latest gossip hitting newsstands.

Take a peek at "Victoria Beckham," "Blue Lights," "Slow Horses," "Antiques Roadshow," "Police Interceptors" and more.

Guest comic Mark Ballas.

Guest comic Gary Anthony Williams.

Celebrity guests discuss their current projects and the latest gossip hitting newsstands.

Take a peek at "Victoria Beckham," "Blue Lights," "Slow Horses," "Antiques Roadshow," "Police Interceptors" and more.

Mind games begin and paranoia sets in, as the Yorkshire girls, Anna and Elizabeth, become increasingly spooked, and Ayo and Madu part company.

A hiker in a remote Canadian wilderness clings on for dear life as a glacial melt flash flood threatens to sweep him away.

Examine strange relics forgotten by time; visit a perturbing circle of stone in the Golan Heights; a mountain of headless statues in Turkey; a castle left to crumble in the Saudi Arabian desert; a time-worn secret in the wilds of Peru.

Visit a strange wood-lined tunnel beneath a Copenhagen train station. Locate one of North America's earliest schools for Black children in Virginia, excavate a warrior cemetery in Finland, and unearth a women-only burial plot beneath a Welsh castle.

Threatening blue lights bombard a famous resort town, evoking the apocalypse, a nuclear meltdown could be behind an ominous blazing beam of light and supersized, underground crystals appear out of this world.

Searching for ways to minimize their carbon footprints, Zac and Darin visit a self-sustaining home and other business innovating to reduce waste.

Examine how seismic activity exposed WW II vessels near Iwo Jima; unravel clues to Maya political intrigue in Guatemala; see why footprints found post-storm are changing English migration history; visit a Neolithic wall on an eroding Scottish coast.

The science behind some of the most incredible engineering accidents ever filmed is revealed; a look at the physics involved as well as forensic details to explain the slip-ups that turned construction into destruction.

A secret military base around the North Pole; a man-made, ancient stone formation below the surface of Lake Huron; a 1500-year-old burial ground on the shores of the Baltic Sea; a life form in the permafrost in Russia's far east.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Guest comic Mark Ballas.

Guest comic Gary Anthony Williams.

A long-forgotten network of Native American earthworks; a baffling battlefield mystery in Belgium; a mysterious blood-red lake on a remote Greek island; an eerie pink glow emulating from the middle of the Pacific Ocean.

The Goggleboxers share their thoughts on "The Celebrity Traitors," "Love Is Blind," "Coronation Street," "The Girlfriend," "Nightmares of Nature," "The Reluctant Traveller" and "Yorkshire Air 999.".

Celebrity guests discuss their current projects and the latest gossip hitting newsstands.

Take a peek at "Victoria Beckham," "Blue Lights," "Slow Horses," "Antiques Roadshow," "Police Interceptors" and more.

Justin Moorhouse, Emmanuel Sonubi and Holly Walsh join.

Sandi Toksvig takes a look at upbringing with Sally Phillips, Josh Pugh, Aaron Simmonds and Alan Davies.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Players who think they know how to unlock a big payout.

Justin Moorhouse, Emmanuel Sonubi and Holly Walsh join.

Sandi Toksvig takes a look at upbringing with Sally Phillips, Josh Pugh, Aaron Simmonds and Alan Davies.

Visit a strange wood-lined tunnel beneath a Copenhagen train station. Locate one of North America's earliest schools for Black children in Virginia, excavate a warrior cemetery in Finland, and unearth a women-only burial plot beneath a Welsh castle.

Though a misfit among his brainy family members, Massachusetts bouncer Doug Glatt has a knockout punch that lands him a spot on a minor-league Canadian hockey team.

The investigation of some of the most notorious and mysterious events, in an attempt to unravel all the possible reasons for the disasters.

A secret military base around the North Pole; a man-made, ancient stone formation below the surface of Lake Huron; a 1500-year-old burial ground on the shores of the Baltic Sea; a life form in the permafrost in Russia's far east.

Visit a strange wood-lined tunnel beneath a Copenhagen train station. Locate one of North America's earliest schools for Black children in Virginia, excavate a warrior cemetery in Finland, and unearth a women-only burial plot beneath a Welsh castle.

Examine how seismic activity exposed WW II vessels near Iwo Jima; unravel clues to Maya political intrigue in Guatemala; see why footprints found post-storm are changing English migration history; visit a Neolithic wall on an eroding Scottish coast.

The investigation of some of the most notorious and mysterious events, in an attempt to unravel all the possible reasons for the disasters.

The science behind some of the most incredible engineering accidents ever filmed is revealed; a look at the physics involved as well as forensic details to explain the slip-ups that turned construction into destruction.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Just after shuttering many businesses in response to the pandemic, Jonesboro, Ark., takes another hit from a natural disaster; an EF3 tornado touches down on the south side of the city and plows across the busiest parts of Jonesboro.

Dr. Cori puts on a smile for her least favorite job, cow pregnancy testing; Dr. Allison treats an orange cat with a skin condition and uses a musical trick to calm the nerves of a soon-to-be neutered dog.

Dr. Emma sets off on a road trip to Siksika Nation to help stray dogs get healthy and find their forever homes; in Saskatoon, Dr. Allison examines a worrying lump on an older dog with a big personality.

Examine how seismic activity exposed WW II vessels near Iwo Jima; unravel clues to Maya political intrigue in Guatemala; see why footprints found post-storm are changing English migration history; visit a Neolithic wall on an eroding Scottish coast.

A long-forgotten network of Native American earthworks; a baffling battlefield mystery in Belgium; a mysterious blood-red lake on a remote Greek island; an eerie pink glow emulating from the middle of the Pacific Ocean.

The Goggleboxers share their thoughts on "The Celebrity Traitors," "Love Is Blind," "Coronation Street," "The Girlfriend," "Nightmares of Nature," "The Reluctant Traveller" and "Yorkshire Air 999.".

Will Kirk and Christina Trevanion take their mobile auction house on the road.

In the summer of 1952, stories of U.S. Air Force jets chasing UFOs over the White House knock the Korean War off the front pages of newspapers; as rumors spread, President Harry S. Truman demands to know what was flying over his house.

Take a peek at "Victoria Beckham," "Blue Lights," "Slow Horses," "Antiques Roadshow," "Police Interceptors" and more.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

Sandi Toksvig is joined by Maisie Adam, Daliso Chaponda, Jack Dee and Alan Davies for a look at some underthings.

Sandi Toksvig goes to university with Guz Khan, Joe Lycett, Morgana Robinson and Alan Davies.

Will Kirk and Christina Trevanion take their mobile auction house on the road.

Take a peek at "Victoria Beckham," "Blue Lights," "Slow Horses," "Antiques Roadshow," "Police Interceptors" and more.

Alaska is a challenging place, but tenacity of the spirit makes it home.

Visit a strange wood-lined tunnel beneath a Copenhagen train station. Locate one of North America's earliest schools for Black children in Virginia, excavate a warrior cemetery in Finland, and unearth a women-only burial plot beneath a Welsh castle.

The science behind some of the most incredible engineering accidents ever filmed is revealed; a look at the physics involved as well as forensic details to explain the slip-ups that turned construction into destruction.

The investigative documentary series "Mysteries Decoded" delves deep into some of America's greatest unsolved mysteries, exploring newly discovered evidence and utilizing high-tech tools in each case. From Area 51 to the Salem witch trials, each episode's investigation is coordinated by Jennifer Marshall, an accomplished U.S. Navy veteran turned top-notch private investigator, as she mobilizes her team to embark on the formidable quest to bring closure to these long-lingering historical puzzles.

Zoom in on some otherworldly sights; spot a giant glacier on the Red Planet, let the milky seas off the coast of Java bathe your vision, ponder a huge hexagon floating above Saturn and take a spin around a doughnut-shaped lake in Saskatchewan.

Visit a strange wood-lined tunnel beneath a Copenhagen train station. Locate one of North America's earliest schools for Black children in Virginia, excavate a warrior cemetery in Finland, and unearth a women-only burial plot beneath a Welsh castle.

The investigative documentary series "Mysteries Decoded" delves deep into some of America's greatest unsolved mysteries, exploring newly discovered evidence and utilizing high-tech tools in each case. From Area 51 to the Salem witch trials, each episode's investigation is coordinated by Jennifer Marshall, an accomplished U.S. Navy veteran turned top-notch private investigator, as she mobilizes her team to embark on the formidable quest to bring closure to these long-lingering historical puzzles.

Explores strongholds abandoned by their architects; a lost city in the Amazon jungle; a desert fortress made by humanity's most notorious empire; explores a city of identical castles; examines a Greek isle's bloody history from the air.

Alaska is a challenging place, but tenacity of the spirit makes it home.

Mind games begin and paranoia sets in, as the Yorkshire girls, Anna and Elizabeth, become increasingly spooked, and Ayo and Madu part company.

The investigative documentary series "Mysteries Decoded" delves deep into some of America's greatest unsolved mysteries, exploring newly discovered evidence and utilizing high-tech tools in each case. From Area 51 to the Salem witch trials, each episode's investigation is coordinated by Jennifer Marshall, an accomplished U.S. Navy veteran turned top-notch private investigator, as she mobilizes her team to embark on the formidable quest to bring closure to these long-lingering historical puzzles.

The investigation of some of the most notorious and mysterious events, in an attempt to unravel all the possible reasons for the disasters.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Dr. Cori taps into her wealth of experience to bring Ranger, the ailing cat, back from a life-or-death situation; in Saskatoon, a lost kitty gets a clean bill of health and finds a loving home with one of Dr. Allison's team members.

Dr. Allison's clinic is full of nerves and worry as she and her staff bring in their own animals for vet care; Dr. Emma picks up some tips for working with small companion animals from Calgary's top exotic vet specialist.

Dive into the historical and natural secrets of the deep; explore an uninhabited concrete island, ocean spirals off the Australian coast, underwater evidence of a violent past and tracks thousands of metres below the sea's surface.

A grim discovery in a Swedish lake reveals ancient practices; in the Canadian Arctic, the fossil of a previously unknown mammal is found; bizarre ice formations in the Antarctic Ocean; a discovery off the east coast of Canada.

Most accounts of UFO sightings can be explained by and attributed to normal earthly phenomena. Those that cannot be solved, however, have police investigators, government officials and researchers puzzled, even decades later in some cases. In each episode of "Close Encounters," two stories of alien phenomena around the world are investigated, re-created and reviewed by researchers. In the telling of each one, the program reveals to viewers facts about thousands of reported occurrences.

Texas police receive multiple calls about a 200-foot flying object; Two farmers witness the bizarre sighting up close; In Scotland, a property inspector is knocked unconscious when he comes in contact with a mysterious metallic object.

Contestants compete across the series, scoring points by answering questions correctly; they must avoid the impossible answers, otherwise they will be eliminated until the next day.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

Confront objects that make no sense; spot a spinning island in an Argentinian marsh, a colossal triangle stuck in the Arizona desert, mysterious multicoloured pools across northern Ethiopia and a huge human figure hidden in the Australian outback.

Experts uncover four global stories of extraordinary curiosities that were once concealed in the deserts of the planet.

A bomb cyclone detonates across northeast America.

A grim discovery in a Swedish lake reveals ancient practices; in the Canadian Arctic, the fossil of a previously unknown mammal is found; bizarre ice formations in the Antarctic Ocean; a discovery off the east coast of Canada.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

Dive into the historical and natural secrets of the deep; explore an uninhabited concrete island, ocean spirals off the Australian coast, underwater evidence of a violent past and tracks thousands of metres below the sea's surface.

Earthquake-proof buildings fall down; a battery factory blows up; and a bridge collapses.

Earthquakes, droughts and collapsing dams expose artifacts and graves.

A tornado bears down on a man and his dog in a New Jersey basement; holding back wildfires with a new homeowner in Australia; a Colorado hailstorm; a Norwegian boxer punches his way through deadly ice.

Earthquake-proof buildings fall down; a battery factory blows up; and a bridge collapses.

Earthquakes, droughts and collapsing dams expose artifacts and graves.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

A bomb cyclone detonates across northeast America.

Confront objects that make no sense; spot a spinning island in an Argentinian marsh, a colossal triangle stuck in the Arizona desert, mysterious multicoloured pools across northern Ethiopia and a huge human figure hidden in the Australian outback.

A grim discovery in a Swedish lake reveals ancient practices; in the Canadian Arctic, the fossil of a previously unknown mammal is found; bizarre ice formations in the Antarctic Ocean; a discovery off the east coast of Canada.

Most accounts of UFO sightings can be explained by and attributed to normal earthly phenomena. Those that cannot be solved, however, have police investigators, government officials and researchers puzzled, even decades later in some cases. In each episode of "Close Encounters," two stories of alien phenomena around the world are investigated, re-created and reviewed by researchers. In the telling of each one, the program reveals to viewers facts about thousands of reported occurrences.

Texas police receive multiple calls about a 200-foot flying object; Two farmers witness the bizarre sighting up close; In Scotland, a property inspector is knocked unconscious when he comes in contact with a mysterious metallic object.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Scientists uncover a city, a chamber, and a complex, and map a tunnel network.

Revealing the truth behind the planet's ancient legends; touring an island covered in polar bears, twin craters in Greece, peeking at a supervolcano hidden under Yellowstone Park and examining an ocean formation that's eerily similar to Atlantis.

In a Danish bog, hundreds of mutilated ancient bones are found, while a mysterious deserted island belonging to Russia is explored.

Walking among colossal wonders scattered across the Earth's surface, including an ancient reptile skeleton, a massive head carving in the Alberta badlands, a giant South African footprint and a pentagram etched into a remote peninsula in Kazakhstan.

Contestants compete across the series, scoring points by answering questions correctly; they must avoid the impossible answers, otherwise they will be eliminated until the next day.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

Take a deep dive into watery enigmas; glide over a sunken Italian city; a unique underwater cemetery in the Florida Keys; a yellow brick road to nowhere in the depths of the North Pacific; puzzling rocky constructions off the coast of Australia.

Experts uncover four global stories of extraordinary curiosities that were once concealed in the deserts of the planet.

Fight an inferno of wildfire with a small village and rescue vacationers from a burning shore in Portugal. Survive a mudslide in the Mojave Desert, flee a waterspout with tourists in North Carolina and watch dramatic rescues from floods in Australia.

In a Danish bog, hundreds of mutilated ancient bones are found, while a mysterious deserted island belonging to Russia is explored.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

Revealing the truth behind the planet's ancient legends; touring an island covered in polar bears, twin craters in Greece, peeking at a supervolcano hidden under Yellowstone Park and examining an ocean formation that's eerily similar to Atlantis.

Rocky Rapids Clinic becomes an emergency room for a dog with troubled breathing; Dr. Allison treats Stu, a dog who can't keep meals down; veterinary students go through a rite of passage when Dr. Cori teaches them how to remove quills from a dog.

Sandi Toksvig joins Bridget Christie, Rosie Jones, Cariad Lloyd and Alan Davies to find out about Ulex and other obscure U words.

Zoe Lyons, Dan Tiernan, and Josh Widdicombe join Sandi.

Sandi Toksvig hosts as "QI" goes voyaging with Nabil Abdulrashid, Joe Lycett, Lou Sanders and Alan Davies.

As winter turns to spring, Alaskans must seize the warming days.

Rocky Rapids Clinic becomes an emergency room for a dog with troubled breathing; Dr. Allison treats Stu, a dog who can't keep meals down; veterinary students go through a rite of passage when Dr. Cori teaches them how to remove quills from a dog.

Sandi Toksvig gets vocal with Ed Byrne, Jimmy Carr, Judi Love and Alan Davies.

Zoe Lyons, Dan Tiernan, and Josh Widdicombe join Sandi.

Sandi Toksvig hosts as "QI" goes voyaging with Nabil Abdulrashid, Joe Lycett, Lou Sanders and Alan Davies.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

Improv veterans Ryan Stiles, Wayne Brady and Colin Mochrie return for a new take on the comedy series with host, Aisha Tyler. Each episode, a special guest star joins the comics as they tackle a series of spontaneous improvised sketches, with only a few random ideas from the studio audience and their host. With little information and a lot of imagination, the comics depict a variety of characters and scenes, and even perform songs. At the end of each round, Aisha awards points to each of the four performers and announces a winner at the end of every episode.

Fight an inferno of wildfire with a small village and rescue vacationers from a burning shore in Portugal. Survive a mudslide in the Mojave Desert, flee a waterspout with tourists in North Carolina and watch dramatic rescues from floods in Australia.

Take a deep dive into watery enigmas; glide over a sunken Italian city; a unique underwater cemetery in the Florida Keys; a yellow brick road to nowhere in the depths of the North Pacific; puzzling rocky constructions off the coast of Australia.

In a Danish bog, hundreds of mutilated ancient bones are found, while a mysterious deserted island belonging to Russia is explored.

Walking among colossal wonders scattered across the Earth's surface, including an ancient reptile skeleton, a massive head carving in the Alberta badlands, a giant South African footprint and a pentagram etched into a remote peninsula in Kazakhstan.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Earthquake-proof buildings fall down; a battery factory blows up; and a bridge collapses.

Traipsing along ancient pathways criss-crossing Easter Island; finding gigantic designs carved into Asia's Eastern Steppe; ascending a tall pyramid rising from Antarctica's icy landscape.

Archaeologists in Russia unearth many mass graves; a World War II American military plane on a Canadian mountain; strange cosmic rays coming from Antarctica's ice; in Russia, researchers investigate a phenomenon involving glowing snow.

A young recruit encounters aliens in the Nevada desert in the 1960s; he claims they were working with the US military and housed a spaceship in a secret hangar nearby.

Contestants compete across the series, scoring points by answering questions correctly; they must avoid the impossible answers, otherwise they will be eliminated until the next day.

Olympic gold medalist Misty May-Treanor; guest comics Brad Sherwood and Jeff Davis.

Special guests Penn & Teller.

Psychedelic swirls in the Utah wastelands; a bizarre configuration of circles in the Sahara; hidden lines with the help of a drone; a remote polka-dot lake in Canada.

Experts uncover four global stories of extraordinary curiosities that were once concealed in the deserts of the planet.

A holiday cruise ship sails into a hurricane, terrifying 4,000 passengers as their cabins are plunged underwater.

Archaeologists in Russia unearth many mass graves; a World War II American military plane on a Canadian mountain; strange cosmic rays coming from Antarctica's ice; in Russia, researchers investigate a phenomenon involving glowing snow.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Olympic gold medalist Misty May-Treanor; guest comics Brad Sherwood and Jeff Davis.

Special guests Penn & Teller.

Traipsing along ancient pathways criss-crossing Easter Island; finding gigantic designs carved into Asia's Eastern Steppe; ascending a tall pyramid rising from Antarctica's icy landscape.

The investigation of some of the most notorious and mysterious events, in an attempt to unravel all the possible reasons for the disasters.

Scientists uncover a city, a chamber, and a complex, and map a tunnel network.

Psychedelic swirls in the Utah wastelands; a bizarre configuration of circles in the Sahara; hidden lines with the help of a drone; a remote polka-dot lake in Canada.

The investigation of some of the most notorious and mysterious events, in an attempt to unravel all the possible reasons for the disasters.

Scientists uncover a city, a chamber, and a complex, and map a tunnel network.

Olympic gold medalist Misty May-Treanor; guest comics Brad Sherwood and Jeff Davis.

Special guests Penn & Teller.

A holiday cruise ship sails into a hurricane, terrifying 4,000 passengers as their cabins are plunged underwater.

Psychedelic swirls in the Utah wastelands; a bizarre configuration of circles in the Sahara; hidden lines with the help of a drone; a remote polka-dot lake in Canada.

Archaeologists in Russia unearth many mass graves; a World War II American military plane on a Canadian mountain; strange cosmic rays coming from Antarctica's ice; in Russia, researchers investigate a phenomenon involving glowing snow.

A young recruit encounters aliens in the Nevada desert in the 1960s; he claims they were working with the US military and housed a spaceship in a secret hangar nearby.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Take a peek at "Victoria Beckham," "Blue Lights," "Slow Horses," "Antiques Roadshow," "Police Interceptors" and more.

Exploring some of the most cavernous places on the planet, including an expansive Siberian crater with no explainable origin, Greenland's bizarre black holes, an ancient forbidden well in the Yemeni desert, and a voluminous void in Antarctica.

A frozen lake deep in the Himalayas melts once a year to expose hundreds of human bones and a centuries-old mystery of astonishing carnage; leaving experts to speculate if it was a single catastrophic event or something much more sinister.

In Brazil, three men escape a close encounter that lasted hours longer than they realized; in Canada, a thirteen-year-old boy is blinded temporally after investigating a bizarre object near his home.

A father and son see mysterious lights near their property and call the sheriff's office; Six police cars try to chase down the object; A large craft covers a French town in an odd material.

Rick Edwards hosts the final chance for one of the 24 players to win the ten thousand pound prize money in the game show.

Guest comic Jack Osbourne.

Guest comic Keegan-Michael Key.

Learning why an important urban center is sinking toward oblivion; soaring over sprawling ruins buried under Saharan sands; learning the modern secret of an ancient fortress; eyeing a ghost town on the edge of the Gobi.

Hurricanes, droughts and storms reveal strange mysteries, relics and artifacts.

Hurricane Florence causes biblical-level flooding in North Carolina; a magnitude seven earthquake rocks Anchorage, Alaska; a colossal wave swamps a surfer in Nazaré, Portugal.

A frozen lake deep in the Himalayas melts once a year to expose hundreds of human bones and a centuries-old mystery of astonishing carnage; leaving experts to speculate if it was a single catastrophic event or something much more sinister.

Budding entrepreneurs get three minutes to pitch their business ideas to five multimillionaires who are willing to invest their own cash to kick-start the businesses in the original "Shark Tank." After each pitch, the Dragons have the opportunity to ask questions about the venture. The entrepreneurs don't always have to answer, but of course what they choose not to address could very well affect the outcome. The pitch is over when each of the Dragons has declared,"I'm out." Evan Davis hosts.

Guest comic Jack Osbourne.

Guest comic Keegan-Michael Key.

Exploring some of the most cavernous places on the planet, including an expansive Siberian crater with no explainable origin, Greenland's bizarre black holes, an ancient forbidden well in the Yemeni desert, and a voluminous void in Antarctica.