An airliner dodges thunderstorms flying to a cyclone-damaged island; aerial firefighters cross the country to battle infernos; daredevil chainsaw operators hang underneath helicopters.

Scientists fly to save Anchorage from avalanche destruction. Border agents stop a potential insect invasion at Anchorage International. A bush pilot flies explosive cargo for a village festival, and the Coast Guard race to repai.

Viewing Northern Italy from the air; the fashion capital of Milan; the canals of Venice; the peaks of the Dolomites; the colorful coast of Cinque Terre.

An airliner dodges thunderstorms flying to a cyclone-damaged island; aerial firefighters cross the country to battle infernos; daredevil chainsaw operators hang underneath helicopters.

Scientists fly to save Anchorage from avalanche destruction. Border agents stop a potential insect invasion at Anchorage International. A bush pilot flies explosive cargo for a village festival, and the Coast Guard race to repai.

Viewing Northern Italy from the air; the fashion capital of Milan; the canals of Venice; the peaks of the Dolomites; the colorful coast of Cinque Terre.

An airliner dodges thunderstorms flying to a cyclone-damaged island; aerial firefighters cross the country to battle infernos; daredevil chainsaw operators hang underneath helicopters.

A breathtaking journey down the German section of the beautiful Moselle river, famous for vineyards on its dramatically steep banks and remarkable meandering loops.

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.

Salvaging a 50-foot motor yacht in Islamorada, Fla.; a 44-foot launch hung up on a dam on the Mississippi River; repairing a major storm gate in the British Isles.

A breathtaking journey down the German section of the beautiful Moselle river, famous for vineyards on its dramatically steep banks and remarkable meandering loops.

The Fermi Paradox asks why another civilization has not presented itself.

Tecumseh forges an alliance with the British in pursuit of his dream.

Salvaging a 50-foot motor yacht in Islamorada, Fla.; a 44-foot launch hung up on a dam on the Mississippi River; repairing a major storm gate in the British Isles.

Examine how German soldiers used an erotic painting and other decoys to distract their captors as they tunnelled out of Island Farm POW camp in Wales; see how American bombardiers were smuggled out of Russia, and study a wartime Trojan Horse plot.

The inside story of the Harrier, the world's most famous short takeoff and vertical landing fighter jet.

Takes an unprecedented look inside the secret chambers of the Great Pyramid of Giza, the only one of the Seven Wonders of the Ancient World still standing, and see what they reveal about the pyramid's origins.

Dig up an epic find in South Dakota that fuels suspicion and misfortune, then examine an Egyptian boy king's tomb plagued by an ancient curse. Study a haunted English painting and ponder a relic coveted by a king that may have doomed his reign.

Exploring the final building phase of the Great Pyramid of Giza and the rituals that took place after a pharaoh dies.

An airliner dodges thunderstorms flying to a cyclone-damaged island; aerial firefighters cross the country to battle infernos; daredevil chainsaw operators hang underneath helicopters.

Scientists fly to save Anchorage from avalanche destruction. Border agents stop a potential insect invasion at Anchorage International. A bush pilot flies explosive cargo for a village festival, and the Coast Guard race to repai.

Viewing Northern Italy from the air; the fashion capital of Milan; the canals of Venice; the peaks of the Dolomites; the colorful coast of Cinque Terre.

On D-Day and later in June 1944, the USS Texas helps silence batteries of German artillery and gun positions defending the landing beaches and the port city of Cherbourg.

Recounting some of maritime warfare's explosions, from world wars and Vietnam to the nuclear tests at Bikini Atoll.

Dictators are characterized as charismatic, narcissistic and sadistic, but most of all by their thirst for power; once in power, holding on to it requires negotiation, coercion and force.

On D-Day and later in June 1944, the USS Texas helps silence batteries of German artillery and gun positions defending the landing beaches and the port city of Cherbourg.

Recounting some of maritime warfare's explosions, from world wars and Vietnam to the nuclear tests at Bikini Atoll.

Dictators are characterized as charismatic, narcissistic and sadistic, but most of all by their thirst for power; once in power, holding on to it requires negotiation, coercion and force.

Exploring the final building phase of the Great Pyramid of Giza and the rituals that took place after a pharaoh dies.

Recounting some of maritime warfare's explosions, from world wars and Vietnam to the nuclear tests at Bikini Atoll.

Dictators are characterized as charismatic, narcissistic and sadistic, but most of all by their thirst for power; once in power, holding on to it requires negotiation, coercion and force.

Exploring the final building phase of the Great Pyramid of Giza and the rituals that took place after a pharaoh dies.

New York's Hudson River stretches 315 miles through natural landscapes, from the Adirondack Mountains to the George Washington Bridge and Statue of Liberty.

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.

Jeremy Birch takes on a salvage to raise a vessel with a concrete hull; it's been in the Fraser River for a month, collecting silt and mud, adding 30 tons to its deadweight.

Examining how cosmic rays are produced and what that can tell us about the universe.

John Norton leads Six Nations warriors against the invading Americans.

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.

Jeremy Birch takes on a salvage to raise a vessel with a concrete hull; it's been in the Fraser River for a month, collecting silt and mud, adding 30 tons to its deadweight.

An airliner dodges thunderstorms flying to a cyclone-damaged island; aerial firefighters cross the country to battle infernos; daredevil chainsaw operators hang underneath helicopters.

A look at how the post-war period and the Cold War unfolded high up in the North; recently published archival material helps to shed light on post-war events in the Arctic.

The early years of Cleopatra's life, during which she survives her upbringing in an incestuous, murderous family and goes on to forge a romantic and political alliance with Julius Caesar.

Viewing Northern Italy from the air; the fashion capital of Milan; the canals of Venice; the peaks of the Dolomites; the colorful coast of Cinque Terre.

Dictators are characterized as charismatic, narcissistic and sadistic, but most of all by their thirst for power; once in power, holding on to it requires negotiation, coercion and force.

On D-Day and later in June 1944, the USS Texas helps silence batteries of German artillery and gun positions defending the landing beaches and the port city of Cherbourg.

Recounting some of maritime warfare's explosions, from world wars and Vietnam to the nuclear tests at Bikini Atoll.

Dictators are characterized as charismatic, narcissistic and sadistic, but most of all by their thirst for power; once in power, holding on to it requires negotiation, coercion and force.

A new performance center with a tent-like glass-and-steel lobby tests engineers in Kansas City; two twisting apartment towers make heads spin in Ontario.

Takes an unprecedented look inside the secret chambers of the Great Pyramid of Giza, the only one of the Seven Wonders of the Ancient World still standing, and see what they reveal about the pyramid's origins.

Uncover the secrets of the Old Kingdom ruler who revolutionized architecture alongside his vizier, Imhotep; piece together the mysterious life of the very first king to build a step pyramid in the heart of a grandiose and complex burial site.

On the site of Dahshur, south of Cairo, are two revolutionary monuments which seem to be the first real pyramids.

Takes an unprecedented look inside the secret chambers of the Great Pyramid of Giza, the only one of the Seven Wonders of the Ancient World still standing, and see what they reveal about the pyramid's origins.

Uncover the secrets of the Old Kingdom ruler who revolutionized architecture alongside his vizier, Imhotep; piece together the mysterious life of the very first king to build a step pyramid in the heart of a grandiose and complex burial site.

On the site of Dahshur, south of Cairo, are two revolutionary monuments which seem to be the first real pyramids.

Takes an unprecedented look inside the secret chambers of the Great Pyramid of Giza, the only one of the Seven Wonders of the Ancient World still standing, and see what they reveal about the pyramid's origins.

Uncover the secrets of the Old Kingdom ruler who revolutionized architecture alongside his vizier, Imhotep; piece together the mysterious life of the very first king to build a step pyramid in the heart of a grandiose and complex burial site.

On the site of Dahshur, south of Cairo, are two revolutionary monuments which seem to be the first real pyramids.

Bill Nighy narrates a trip along the River Po, traveling across northern Italy from the snow-capped Alps to the delta where it meets the Adriatic Sea.

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.

New York's Hudson River stretches 315 miles through natural landscapes, from the Adirondack Mountains to the George Washington Bridge and Statue of Liberty.

Examining Landsat 8, the advanced planetary explorer with a 900 million dollar price tag, which is designed to reveal complex and ever-changing details undetectable by the human eye.

East coast shipper creates a private fleet to seize American ships.

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.

Bill Nighy narrates a trip along the River Po, traveling across northern Italy from the snow-capped Alps to the delta where it meets the Adriatic Sea.

The story of the greatest tank battle the world has ever seen.

The scale of World War II grows as the United States joins the war; explore the operations where Allied commando troops raid the Norwegian coast.

The inside story of the Harrier, the world's most famous short takeoff and vertical landing fighter jet.

Mike helps fix the vessels that the U.S. Coast Guard use to keep the oceans safe; he replaces key parts of ship engines, removes a large crane from a buoy tender, and fixes a helicopter for a critical exercise.

A new performance center with a tent-like glass-and-steel lobby tests engineers in Kansas City; two twisting apartment towers make heads spin in Ontario.

Takes an unprecedented look inside the secret chambers of the Great Pyramid of Giza, the only one of the Seven Wonders of the Ancient World still standing, and see what they reveal about the pyramid's origins.

Uncover the secrets of the Old Kingdom ruler who revolutionized architecture alongside his vizier, Imhotep; piece together the mysterious life of the very first king to build a step pyramid in the heart of a grandiose and complex burial site.

On the site of Dahshur, south of Cairo, are two revolutionary monuments which seem to be the first real pyramids.

An archaeological revolution has been underway for 15 years, driven by technology; from the rise of the first empire to the creation of the megalithic site of Newgrange, new technologies are revealing previously unknown chapters of antiquity.

Learn how displaced artifacts spark fresh investigations and rewrite timelines. Unearth a forgotten tragedy in a remote mountain lake in India, check out footprints that change human migration stories, and reopen an ancient cold case in England.

Revisit the crimes of Jack the Ripper as investigators try to ID his first victim. Chase the Mad Gasser, who terrorized an Illinois town in 1944, then hunt for the Servant Girl Annihilator, a killer who stalked Austin, Texas, in the darkness.

An archaeological revolution has been underway for 15 years, driven by technology; from the rise of the first empire to the creation of the megalithic site of Newgrange, new technologies are revealing previously unknown chapters of antiquity.

Learn how displaced artifacts spark fresh investigations and rewrite timelines. Unearth a forgotten tragedy in a remote mountain lake in India, check out footprints that change human migration stories, and reopen an ancient cold case in England.

Revisit the crimes of Jack the Ripper as investigators try to ID his first victim. Chase the Mad Gasser, who terrorized an Illinois town in 1944, then hunt for the Servant Girl Annihilator, a killer who stalked Austin, Texas, in the darkness.

An archaeological revolution has been underway for 15 years, driven by technology; from the rise of the first empire to the creation of the megalithic site of Newgrange, new technologies are revealing previously unknown chapters of antiquity.

Learn how displaced artifacts spark fresh investigations and rewrite timelines. Unearth a forgotten tragedy in a remote mountain lake in India, check out footprints that change human migration stories, and reopen an ancient cold case in England.

Revisit the crimes of Jack the Ripper as investigators try to ID his first victim. Chase the Mad Gasser, who terrorized an Illinois town in 1944, then hunt for the Servant Girl Annihilator, a killer who stalked Austin, Texas, in the darkness.

An archaeological revolution has been underway for 15 years, driven by technology; from the rise of the first empire to the creation of the megalithic site of Newgrange, new technologies are revealing previously unknown chapters of antiquity.

Bill Nighy leads a magical journey in the Norfolk Broads along England's holiday river, the River Bure; discovering a watery world where both wildlife and recreation go hand in hand.

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.

Bill Nighy narrates a trip along the River Po, traveling across northern Italy from the snow-capped Alps to the delta where it meets the Adriatic Sea.

Salvaging a 50-foot motor yacht in Islamorada, Fla.; a 44-foot launch hung up on a dam on the Mississippi River; repairing a major storm gate in the British Isles.

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.

Bill Nighy leads a magical journey in the Norfolk Broads along England's holiday river, the River Bure; discovering a watery world where both wildlife and recreation go hand in hand.

The scale of World War II grows as the United States joins the war; explore the operations where Allied commando troops raid the Norwegian coast.

The early years of Cleopatra's life, during which she survives her upbringing in an incestuous, murderous family and goes on to forge a romantic and political alliance with Julius Caesar.

The story of the greatest tank battle the world has ever seen.

A look at how the post-war period and the Cold War unfolded high up in the North; recently published archival material helps to shed light on post-war events in the Arctic.

Archaeologists reveal how the Colosseum came to symbolize the might of Rome.

An archaeological revolution has been underway for 15 years, driven by technology; from the rise of the first empire to the creation of the megalithic site of Newgrange, new technologies are revealing previously unknown chapters of antiquity.

Learn how displaced artifacts spark fresh investigations and rewrite timelines. Unearth a forgotten tragedy in a remote mountain lake in India, check out footprints that change human migration stories, and reopen an ancient cold case in England.

Revisit the crimes of Jack the Ripper as investigators try to ID his first victim. Chase the Mad Gasser, who terrorized an Illinois town in 1944, then hunt for the Servant Girl Annihilator, a killer who stalked Austin, Texas, in the darkness.

A US sub shows unbelievable courage in the face of impossible odds. A look into how a bomb dropped by the Japanese forces pushes the craft into a deadly dive, and ignites a toxic chemical fire that leaves the crew fighting for their lives.

The history of the KC-135 Stratotanker, the 60-year-old aerial refueler that keeps fighter jets flying.

Months after the Pearl Harbor attack, shock waves reverberate in every corner of the Pacific; Americans deploy to stem the enemy's advance; after culture clashes, Allied forces later bond over efforts to thwart Japan's move to control New Guinea.

A US sub shows unbelievable courage in the face of impossible odds. A look into how a bomb dropped by the Japanese forces pushes the craft into a deadly dive, and ignites a toxic chemical fire that leaves the crew fighting for their lives.

The history of the KC-135 Stratotanker, the 60-year-old aerial refueler that keeps fighter jets flying.

Months after the Pearl Harbor attack, shock waves reverberate in every corner of the Pacific; Americans deploy to stem the enemy's advance; after culture clashes, Allied forces later bond over efforts to thwart Japan's move to control New Guinea.

A US sub shows unbelievable courage in the face of impossible odds. A look into how a bomb dropped by the Japanese forces pushes the craft into a deadly dive, and ignites a toxic chemical fire that leaves the crew fighting for their lives.

The history of the KC-135 Stratotanker, the 60-year-old aerial refueler that keeps fighter jets flying.

Months after the Pearl Harbor attack, shock waves reverberate in every corner of the Pacific; Americans deploy to stem the enemy's advance; after culture clashes, Allied forces later bond over efforts to thwart Japan's move to control New Guinea.

A US sub shows unbelievable courage in the face of impossible odds. A look into how a bomb dropped by the Japanese forces pushes the craft into a deadly dive, and ignites a toxic chemical fire that leaves the crew fighting for their lives.

How humans discovered the planets and how they became a complex solar system.

Venus offers a complex story with its thick atmosphere and a substantial amount of matter.

The journey down the attraction-packed Niagara River is filled with adventure and beauty; navigating the fascinating history and engineering of this border river between Canada and the United States, arriving at the world-famous Niagara Falls.

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.

How humans discovered the planets and how they became a complex solar system.

Venus offers a complex story with its thick atmosphere and a substantial amount of matter.

Crews work around the clock to build the world's largest underwater concrete bed to salvage the Costa Concordia; operating in secrecy, teams work under high security to repair one of the world's most iconic cruise liners.

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 early years of Cleopatra's life, during which she survives her upbringing in an incestuous, murderous family and goes on to forge a romantic and political alliance with Julius Caesar.

A look at how the post-war period and the Cold War unfolded high up in the North; recently published archival material helps to shed light on post-war events in the Arctic.

The first invasion of the Italian Campaign of WWII: Operation Husky.

The story of the greatest tank battle the world has ever seen.

The scale of World War II grows as the United States joins the war; explore the operations where Allied commando troops raid the Norwegian coast.

A US sub shows unbelievable courage in the face of impossible odds. A look into how a bomb dropped by the Japanese forces pushes the craft into a deadly dive, and ignites a toxic chemical fire that leaves the crew fighting for their lives.

The first invasion of the Italian Campaign of WWII: Operation Husky.

The scale of World War II grows as the United States joins the war; explore the operations where Allied commando troops raid the Norwegian coast.

Take a look at some of the escapes that took place during World War II.

During the Battle of the Bulge, a young U.S. scout gets trapped behind enemy lines.

While Nazi Germany attempts to cover up the brutal murders of a serial killer, a brilliant detective uses early forensic methods to bring him to justice.

Take a look at some of the escapes that took place during World War II.

During the Battle of the Bulge, a young U.S. scout gets trapped behind enemy lines.

While Nazi Germany attempts to cover up the brutal murders of a serial killer, a brilliant detective uses early forensic methods to bring him to justice.

During the Battle of the Bulge, a young U.S. scout gets trapped behind enemy lines.

Exploring the final building phase of the Great Pyramid of Giza and the rituals that took place after a pharaoh dies.

While Nazi Germany attempts to cover up the brutal murders of a serial killer, a brilliant detective uses early forensic methods to bring him to justice.

During the Battle of the Bulge, a young U.S. scout gets trapped behind enemy lines.

Earth's closest neighbor, the moon, is the cosmic stepping stone to a future with the planets.

A fleet of spacecraft orbits, and sometimes lands on the surface of, Mars.

A breathtaking journey down the German section of the beautiful Moselle river, famous for vineyards on its dramatically steep banks and remarkable meandering loops.

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.

Earth's closest neighbor, the moon, is the cosmic stepping stone to a future with the planets.

A fleet of spacecraft orbits, and sometimes lands on the surface of, Mars.

Jeremy Birch takes on a salvage to raise a vessel with a concrete hull; it's been in the Fraser River for a month, collecting silt and mud, adding 30 tons to its deadweight.

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.

Viewing Northern Italy from the air; the fashion capital of Milan; the canals of Venice; the peaks of the Dolomites; the colorful coast of Cinque Terre.

An archaeological revolution has been underway for 15 years, driven by technology; from the rise of the first empire to the creation of the megalithic site of Newgrange, new technologies are revealing previously unknown chapters of antiquity.

Learn how displaced artifacts spark fresh investigations and rewrite timelines. Unearth a forgotten tragedy in a remote mountain lake in India, check out footprints that change human migration stories, and reopen an ancient cold case in England.

Revisit the crimes of Jack the Ripper as investigators try to ID his first victim. Chase the Mad Gasser, who terrorized an Illinois town in 1944, then hunt for the Servant Girl Annihilator, a killer who stalked Austin, Texas, in the darkness.

Takes an unprecedented look inside the secret chambers of the Great Pyramid of Giza, the only one of the Seven Wonders of the Ancient World still standing, and see what they reveal about the pyramid's origins.

Uncover the secrets of the Old Kingdom ruler who revolutionized architecture alongside his vizier, Imhotep; piece together the mysterious life of the very first king to build a step pyramid in the heart of a grandiose and complex burial site.

On the site of Dahshur, south of Cairo, are two revolutionary monuments which seem to be the first real pyramids.

The story of Cleopatra's fall from grace in Egypt after the death of Julius Caesar; how Cleopatra tried to win the heart of Mark Antony, which turned out to be a fatal decision.

The American Museum of Natural History in NYC gets a cave-like extension; an arts center inspired by migrating birds is built on a lake in China; Boston University gains a fossil-free, Jenga-like tower.

Mike helps fix the machines that keep one of the United States' biggest ports moving; he assists a team in moving a 3-million pound crane.

Going behind the scenes with the Panama Canal Railway; big track repairs, massive machines, and unrelenting deadlines.

The American Museum of Natural History in NYC gets a cave-like extension; an arts center inspired by migrating birds is built on a lake in China; Boston University gains a fossil-free, Jenga-like tower.

Mike helps fix the machines that keep one of the United States' biggest ports moving; he assists a team in moving a 3-million pound crane.

Going behind the scenes with the Panama Canal Railway; big track repairs, massive machines, and unrelenting deadlines.

The American Museum of Natural History in NYC gets a cave-like extension; an arts center inspired by migrating birds is built on a lake in China; Boston University gains a fossil-free, Jenga-like tower.

Mike helps fix the machines that keep one of the United States' biggest ports moving; he assists a team in moving a 3-million pound crane.

Going behind the scenes with the Panama Canal Railway; big track repairs, massive machines, and unrelenting deadlines.

The American Museum of Natural History in NYC gets a cave-like extension; an arts center inspired by migrating birds is built on a lake in China; Boston University gains a fossil-free, Jenga-like tower.

Traveling the Dordogne River via traditional boats through the green heart of southwest France; drinking wine and hunting for truffles; riding a luxury cruiser to a lighthouse built for a king.

Get petrified by cryptic rock structures normally hidden from view; look inside curious dwellings in the Peruvian Andes; visit a sacred monolith in Wyoming's Black Hills; haunt a Turkish stone village; spot an immovable waterfall in Mexico.

Chris Ward sets out with Josh Moreira and Ward's younger brother to salvage a light aircraft that's sitting on the seabed; Jeremy Birch braves the arctic conditions to salvage two vessels that have fallen prey to the crushing ice conditions.

Traveling the Dordogne River via traditional boats through the green heart of southwest France; drinking wine and hunting for truffles; riding a luxury cruiser to a lighthouse built for a king.

Jupiter, Saturn, Uranus and Neptune all have exotic atmospheres, liquid interiors and rings.

Isaac Brock's daring made him a hero, but may also be his flaw.

Chris Ward sets out with Josh Moreira and Ward's younger brother to salvage a light aircraft that's sitting on the seabed; Jeremy Birch braves the arctic conditions to salvage two vessels that have fallen prey to the crushing ice conditions.

Tease out the common denominators that lead to tyranny; map the rise of some of the 20th century's dictators and discover how they seized power, exploited governing systems and gutted existing power structures to gain total control.

Uncover the sinister ways that dictators convince their followers to worship them as heroes; watch how they weave mythical narratives around their abilities, selling themselves as saviors who should hold absolute power over the people.

Dictators may appear omnipotent, but their position depends largely on a network of individuals who benefit from their rule, and their support does not come cheap.

Dictators are characterized as charismatic, narcissistic and sadistic, but most of all by their thirst for power; once in power, holding on to it requires negotiation, coercion and force.

Dictators often attempt to expand their jurisdiction beyond the borders of their country; this usually means armed invasion and the death of large numbers of soldiers and civilians.

Consider the factors that inevitably cause dictatorships to crumble; look at how hubris destroys cults of personality; see how factions fracture military dictatorships; weigh the miscalculations that turn the tide against tyranny.

Mike helps fix the machines that keep one of the United States' biggest ports moving; he assists a team in moving a 3-million pound crane.

The American Museum of Natural History in NYC gets a cave-like extension; an arts center inspired by migrating birds is built on a lake in China; Boston University gains a fossil-free, Jenga-like tower.

A K9 anti-poaching squad flies into action, a heavy-lift helicopter flies emergency supply missions across a storm-ravaged island and an airliner races to reach its destination before a power outage plunges the airport into dark.

A DC-6 flies into fuel-freezing weather to deliver vital medicine. A rookie Coast Guard rescue swimmer faces his final helicopter test.

The islands of Italy come in all shapes and sizes; they are home to volcanoes, ancient civilizations and some of the bluest waters on Earth.

A K9 anti-poaching squad flies into action, a heavy-lift helicopter flies emergency supply missions across a storm-ravaged island and an airliner races to reach its destination before a power outage plunges the airport into dark.

A DC-6 flies into fuel-freezing weather to deliver vital medicine. A rookie Coast Guard rescue swimmer faces his final helicopter test.

The islands of Italy come in all shapes and sizes; they are home to volcanoes, ancient civilizations and some of the bluest waters on Earth.

A K9 anti-poaching squad flies into action, a heavy-lift helicopter flies emergency supply missions across a storm-ravaged island and an airliner races to reach its destination before a power outage plunges the airport into dark.

A DC-6 flies into fuel-freezing weather to deliver vital medicine. A rookie Coast Guard rescue swimmer faces his final helicopter test.

The islands of Italy come in all shapes and sizes; they are home to volcanoes, ancient civilizations and some of the bluest waters on Earth.

A K9 anti-poaching squad flies into action, a heavy-lift helicopter flies emergency supply missions across a storm-ravaged island and an airliner races to reach its destination before a power outage plunges the airport into dark.

Rumoured to be the cleanest river in Europe, few dispute it's the coldest; cascading down from the Dinaric Alps in Serbia, it soon crosses the border into Bosnia Herzegovina, where marine biologist and fisherman Sanel Riđanović casts for salmon.

Witness animal spectacles from high above the Earth; watch a whirling herd of northern nomads; see undersea behemoths show off in the Pacific shallows; track a U.S. porcine stampede; confront top ocean predators on the Florida coast.

Bundles of cedar wood tree trunks are smashed apart, releasing thousands of logs on the shoreline; Jeremy and his crew must work fast to recover the cargo.

Rumoured to be the cleanest river in Europe, few dispute it's the coldest; cascading down from the Dinaric Alps in Serbia, it soon crosses the border into Bosnia Herzegovina, where marine biologist and fisherman Sanel Riđanović casts for salmon.

The history of the solar system might be preserved out in the dark domain of Pluto and beyond.

Paid programming.

Bundles of cedar wood tree trunks are smashed apart, releasing thousands of logs on the shoreline; Jeremy and his crew must work fast to recover the cargo.

Explore three discoveries that change what we know about magic and superstition; delve into a Polish vampire grave, open a UK witch bottle used to ward off evil, and see if alien-like skulls in Mexico were shaped by humans or otherworldly beings.

Exhume chilling insights into ancient rituals, legendary warriors, and brutal deaths; investigate dozens of children's skeletons in Peru, find out if Amazon warriors once lived in Russia, and see what a UK cave full of butchered remains reveals.

Challenge long-held beliefs about Viking leadership, weaponry, and brutality; inspect a warriors tomb full of clues in Sweden, a sword of unparalleled quality in Norway, and a pile of headless skeletons in the UK that reveal unimaginable violence.

Discover shocking truths about religious rituals, sacred symbols, and spiritual traditions. Learn the brutal truth about execution rites in Roman England, look at shark bones in a Peruvian temple, and unearth a secret silver amulet in Germany.

Rethink what we know about death and preservation. See why Denmark's perfectly preserved Tollund Man raises haunting questions, observe Portuguese bodies that rewrite history, and uncover the dark mystery of Scotland's Frankenstein mummies.

Open burial sites filled with secrets. Find powerful artifacts in a French rulers tomb, see what a tomb adorned with conch shells says about sacred ceremonies, and expose complex beliefs about animals and the afterlife in an Egyptian zoo graveyard.

A DC-6 flies into fuel-freezing weather to deliver vital medicine. A rookie Coast Guard rescue swimmer faces his final helicopter test.

The islands of Italy come in all shapes and sizes; they are home to volcanoes, ancient civilizations and some of the bluest waters on Earth.

Allied convoys resupplying the Soviet Union navigate the Arctic, infested with U-boats and enemy aircraft.

Stories of historic Black struggle for equality in maritime combat; an enslaved powder boy who served during the French and Indian War; a Civil War gunner; the first African American to command a vessel with a fully integrated crew: Hugh Mulzac.

Dictators often attempt to expand their jurisdiction beyond the borders of their country; this usually means armed invasion and the death of large numbers of soldiers and civilians.

Allied convoys resupplying the Soviet Union navigate the Arctic, infested with U-boats and enemy aircraft.

Stories of historic Black struggle for equality in maritime combat; an enslaved powder boy who served during the French and Indian War; a Civil War gunner; the first African American to command a vessel with a fully integrated crew: Hugh Mulzac.

Dictators often attempt to expand their jurisdiction beyond the borders of their country; this usually means armed invasion and the death of large numbers of soldiers and civilians.

Egyptologists try to determine who built the Sphinx and why by exploring the power struggles between Khufu's sons after the pharaoh's death.

Stories of historic Black struggle for equality in maritime combat; an enslaved powder boy who served during the French and Indian War; a Civil War gunner; the first African American to command a vessel with a fully integrated crew: Hugh Mulzac.

Dictators often attempt to expand their jurisdiction beyond the borders of their country; this usually means armed invasion and the death of large numbers of soldiers and civilians.

Egyptologists try to determine who built the Sphinx and why by exploring the power struggles between Khufu's sons after the pharaoh's death.

Tackling the grade 6 rapids and untamed waters of the Buller River on the west coast of New Zealand's South Island, blessed by a Māori elder of the Ngāti Apa ki te Rā Tō.

Get a bird's-eye view of a mysterious explosion in China and a quickly melting glacier on Earth's iciest continent; investigate an orange haze enveloping the Big Apple, then float over a toxic, too-hot-to-handle lake in New Zealand.

Arctic conditions continue to wreak havoc in British Columbia; Jeremy Birch is called upon to raise a concrete-hulled vessel.

Jupiter, Saturn, Uranus and Neptune all have exotic atmospheres, liquid interiors and rings.

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Get a bird's-eye view of a mysterious explosion in China and a quickly melting glacier on Earth's iciest continent; investigate an orange haze enveloping the Big Apple, then float over a toxic, too-hot-to-handle lake in New Zealand.

Arctic conditions continue to wreak havoc in British Columbia; Jeremy Birch is called upon to raise a concrete-hulled vessel.

Look into the strange disappearance of the Lost Colony of Roanoke in 1590, then discover how the Hope Diamond was stolen during the French Revolution; pinpoint new clues that could explain why the USS Cyclops vanished in 1918 in the Bermuda Triangle.

Contemplate the strange disappearance and reappearance of the master of macabre, Edgar Allan Poe, just before his death in 1849; explore the chilling rumor that Shakespeare's grave was robbed, then chase down thieves who stole the Mona Lisa in 1911.

Investigate the sudden death of a tycoon linked to King Tut's tomb; search for three lighthouse keepers who vanished from the Flannan Isles, then analyze the gruesome, unexplained deaths of nine hikers at the Dyatlov Pass in the Ural Mountains.

Uncover how a royal imprisoned two princes and took the British throne. Ponder how the Irish crown jewels were stolen from a locked safe inside Dublin Castle, then see if the death of Amy Robsart at Elizabeth I's court was an accident or murder.

Hunt for the Amber Room, a Nazi-looted treasure that disappeared in 1944. Track the final flight of bandleader Glenn Miller over the English Channel, then re-examine the arrest of Anne Frank to see if she was betrayed or a victim of coincidence.

Question whether Napoleon Bonaparte was poisoned in exile, then find out whose bones were buried underneath Benjamin Franklin's London home; analyze evidence that suggests that Grand Duchess Anastasia may have escaped the 1918 Romanov massacre.

Stories of historic Black struggle for equality in maritime combat; an enslaved powder boy who served during the French and Indian War; a Civil War gunner; the first African American to command a vessel with a fully integrated crew: Hugh Mulzac.

Dictators often attempt to expand their jurisdiction beyond the borders of their country; this usually means armed invasion and the death of large numbers of soldiers and civilians.

Celebrating one of humanities biggest engineering achievements, the International Space Station, a meteor proof lab bigger than a football field, constructed by astronauts traveling 250 miles above us at 17,500 miles an hour.

Takes a look inside the Pyramid of Menkaure and its unfinished bicolor monument, including a chamber made entirely of graphite and a sarcophagus buried at sea.

Ramesses II reigns for 66 years and builds monuments and temples.

The world has its focus on the Pyramid of Khufu in Egypt, but nearby on the Giza plateau, other architectural masterpieces stand the test of time.

Takes a look inside the Pyramid of Menkaure and its unfinished bicolor monument, including a chamber made entirely of graphite and a sarcophagus buried at sea.

Ramesses II reigns for 66 years and builds monuments and temples.

The world has its focus on the Pyramid of Khufu in Egypt, but nearby on the Giza plateau, other architectural masterpieces stand the test of time.

Takes a look inside the Pyramid of Menkaure and its unfinished bicolor monument, including a chamber made entirely of graphite and a sarcophagus buried at sea.

Ramesses II reigns for 66 years and builds monuments and temples.

The world has its focus on the Pyramid of Khufu in Egypt, but nearby on the Giza plateau, other architectural masterpieces stand the test of time.

The St. Lawrence River is one that forged North America, allowing ships to traverse the continent; the adventure begins in Canada's first capital city of Kingston and near Canada's second-largest city of Montreal.

Examine mysterious holes in Isreal; explore a ghost village hidden in the Colombian jungle, a shipwreck off the coast of Sri Lanka and a gutted airplane fuselage abandoned in Iceland.

Tackling the grade 6 rapids and untamed waters of the Buller River on the west coast of New Zealand's South Island, blessed by a Māori elder of the Ngāti Apa ki te Rā Tō.

A dramatic repair mission gives the Hubble Space Telescope another chance to capture stunning pictures like only it can.

Paid programming.

Examine mysterious holes in Isreal; explore a ghost village hidden in the Colombian jungle, a shipwreck off the coast of Sri Lanka and a gutted airplane fuselage abandoned in Iceland.

The St. Lawrence River is one that forged North America, allowing ships to traverse the continent; the adventure begins in Canada's first capital city of Kingston and near Canada's second-largest city of Montreal.

Allied convoys resupplying the Soviet Union navigate the Arctic, infested with U-boats and enemy aircraft.

In May 1941, the British Royal Navy relentlessly pursues the formidable battleship Bismarck with the mission to sink it at any cost.

The rise of submarines marks World War II at sea, leading to fierce battles above and below the waves.

On July 3, 1940, the British fleet attacks the French navy at Mers el-Kébir, Algeria; in ten minutes, Bretagne sank, Mogador was destroyed, and Provence and Dunkerque were grounded.

Allied convoys resupplying the Soviet Union navigate the Arctic, infested with U-boats and enemy aircraft.

In May 1941, the British Royal Navy relentlessly pursues the formidable battleship Bismarck with the mission to sink it at any cost.

Ramesses II reigns for 66 years and builds monuments and temples.

The world has its focus on the Pyramid of Khufu in Egypt, but nearby on the Giza plateau, other architectural masterpieces stand the test of time.