Zoroastrians, Neanderthals, The Bo: Explore another three ancient cultures and their relationship with death - Zoroastrians, Mongolia and the Bo. (S1, ep 2).

The Secret Grave of Ridgeway Hill: In 2009, a mass grave was discovered in Dorset. Can the skeletons reveal any details about how these Vikings met their gruesome end? (S1, ep 2).

Voices of the Gods: Do India's Sanskrit texts, with their descriptions of advanced technology, lend themselves to the theory that aliens once walked amongst us? (S10, ep 10).

The Animal Agenda: Going by ancient cultures' depictions of gods appearing as animals, could it be that extraterrestrials bear more resemblance to animals than humans? (S10, ep 11).

The Replicants: While many believe in reincarnation, experts suggest that extraterrestrials designed the human body to be a vessel for otherworldly beings. (S10, ep 12).

It's spring 1944 and on the Eastern Front, the momentum is firmly with allies as the war moves into its final, violent act. (S1, ep 7).

By January 1945, it seemed the end of the war was in sight - but challenges still loomed on the Eastern Front, in the Pacific and in Western Europe. (1 of 8).

The Gates of Hell 1941-1942: In the shadow of the war, the Nazi regime gradually advances its \"final solution to the Jewish problem\", culminating in the Holocaust. (S1, ep 7).

Genocide 1942-1944: Along with Treblinka and Majdanek, Sobibor was one of the camps used in Operation Reinhard, in which the Nazis murdered almost two million people. (S1, ep 8).

The restoration is complete and relatives of the original crew share their incredible stories as they board the aircraft. Will it survive a gruelling voyage over the Atlantic? (3 of 3).

Marking the 75th anniversary of D-Day, a special documentary explores the world-changing event through the incredible images and recollections of veteran photographers.

The race to develop the first atomic bomb was critical amid the struggle for WWII victory. Experts reveal new evidence behind Germany's top-secret development of nuclear weapons. (S1, ep 1).

In the final months of WWII, how close were the Nazis and Japan to creating the nuclear explosion that would win the war? Experts and historians examine the evidence. (S1, ep 2).

Afghanistan 30 Years of War: Soviet troops withdraw from Afghanistan in 1989 after fighting a force funded by the US. Should the US be blamed for the rise of Islamic terrorism? (S2, ep 4).

The Psychograph, the Blood Mask and the Cursed Chicken Pot: Investigate a machine which can supposedly read personalities, a mask painted with human blood and a cursed pot. (S2, ep 4).

Chicago: Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing UFO encounters of recent times. (S1, ep 7).

Rise Of The Machines: We rely on machines for virtually every aspect of modern life. But is technology going too far, too fast? And will humans suffer the consequences? (S1, ep 10).

Stargate Portals: Discover the locations of stargate portals around the world. Thought to be doorways to wormholes in time, who is battling to open them and why? (S1, ep 11).

The Apocalypse Code: Sir Isaac Newton is considered one of history's great geniuses, but did you know he also predicted the date of the apocalypse? (S1, ep 1).

UFO's vs Airlines: Are UFOs a threat to civil aviation? The culture of silence within the aviation industry could speak volumes. (5 of 6).

An Australian banana farmer spots a saucer-shaped UFO rising out of a swamp in 1966. That same year in Victoria, a man veers off the road while distracted by lights in the sky. (S1, ep 9).

A policeman hears a loud roar and sees an oval-shaped UFO in New Mexico in 1964. In 1994, a postal worker in Frankfurt spots an aura of light and a luminous object in the sky. (S1, ep 10).

Voices of the Gods: Do India's Sanskrit texts, with their descriptions of advanced technology, lend themselves to the theory that aliens once walked amongst us? (S10, ep 10).

The Animal Agenda: Going by ancient cultures' depictions of gods appearing as animals, could it be that extraterrestrials bear more resemblance to animals than humans? (S10, ep 11).

The Replicants: While many believe in reincarnation, experts suggest that extraterrestrials designed the human body to be a vessel for otherworldly beings. (S10, ep 12).

X-Rated: This episode delves into the truth behind the rumours of Hitler's sex life, including whispers of homosexuality, voyeurism and sadomasochism. (1 of 4).

England: A walk through England's spookiest castles, where the walls have witnessed centuries of bloodshed. (1 of 4).

Alan Godfrey/'Abductions': Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing recent UFO encounters. (S1, ep 8).

Hidden Pyramids: Experts investigate ancient man's apparent obsession with building pyramids, and whether extra-terrestrials may have helped with their construction. (S7, ep 11).

The Alien Agenda: Ancient alien theorists investigate evidence suggesting that extraterrestrials have played a pivotal role in the progress of mankind. (S7, ep 12).

Waterloo Dead: On its 200th anniversary, a team of experts uncover hidden mysteries of the Battle of Waterloo - one of the greatest and bloodiest battles ever fought. (S3, ep 7).

Cornwall Part One: Andy embarks on a mission to unearth the Cornish sites of King Arthur, before magnet fishing for Excalibur and visiting the grave of a legendary witch. (S1, ep 2).

Vikings: Rick Edwards joins YouTuber and detectorist Beau Ouimette on an underwater hunt for lost treasures linked to the ancient Vikings. (S1, ep 4).

Hidden Pyramids: Experts investigate ancient man's apparent obsession with building pyramids, and whether extra-terrestrials may have helped with their construction. (S7, ep 11).

The Alien Agenda: Ancient alien theorists investigate evidence suggesting that extraterrestrials have played a pivotal role in the progress of mankind. (S7, ep 12).

The Missing Jackson Letter: Taylor unearths new testimony from a witness to Slumach's execution and a deathbed letter sends Adam and Kru on a dangerous glacial trek. (S1, ep 1).

Cornwall Part Two: Andy is back in Cornwall searching for legends, meeting a real-life mermaid and fishing for Cornwall's infamous sea serpent Morgawr. (S1, ep 3).

Atlantis: The 'lost' island subcontinent, often idealised as an advanced, utopian society with the wisdom to bring world peace, has captivated dreamers for generations. (S1, ep 6).

Empress of Britain: A fabulous cruise ship for the super wealthy, the Empress of Britain was called up for war duty and entered an epic final battle with the German Luftwaffe. (S2, ep 5).

The Killer Code: The Zodiac Killer Code reveals the desperate bid to crack the crazed codes sent by America's most mysterious serial killer. (S1, ep 2).

The Art and War: After thriving for three centuries, the Celts turned from traders into proven warriors, weapon masters and metal artists in a time that became their golden age. (2 of 3).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 2).

Behind the Hunt: Head behind the scenes with Ton and Allen as they offer a crash course on how to win big at auctions. (S1, ep 9).

Scotland: The restless spirits of victims of cruel torture and untimely death are said to linger in the haunted castles of Scotland. (2 of 4).

The Power of the Ark: The Ark of the Covenant is believed to possess a mythical power. The team trace the ark's destructive path to uncover the truth behind its elusive journey. (S1, ep 4).

Ohio Grassman: According to stories and sightings, the Grassman is similar to Bigfoot, but builds strange nests and has been known to attack. Can science help explain this creature.

Hidden Pyramids: Experts investigate ancient man's apparent obsession with building pyramids, and whether extra-terrestrials may have helped with their construction. (S7, ep 11).

The Alien Agenda: Ancient alien theorists investigate evidence suggesting that extraterrestrials have played a pivotal role in the progress of mankind. (S7, ep 12).

Behind the Hunt: Head behind the scenes with Ton and Allen as they offer a crash course on how to win big at auctions. (S1, ep 9).

Edinburgh: A look at one of Scotland's most popular paid tourist attraction. With a slew of sieges to its name, it is no surprise that the site boasts some formidable defences. (1 of 5).

Empress of Britain: A fabulous cruise ship for the super wealthy, the Empress of Britain was called up for war duty and entered an epic final battle with the German Luftwaffe. (S2, ep 5).

The Killer Code: The Zodiac Killer Code reveals the desperate bid to crack the crazed codes sent by America's most mysterious serial killer. (S1, ep 2).

Aliens And Robots: Experts investigate ancient tales and accounts of robots. If these sophisticated machines did exist in bygone days, what might have happened to them? (S8, ep 1).

Aliens B.C: Experts investigate whether the stories of a time when gods and otherworldly beings inhabited the planet are more than mere mythology. (S8, ep 2).

The Missing Jackson Letter: Taylor unearths new testimony from a witness to Slumach's execution and a deathbed letter sends Adam and Kru on a dangerous glacial trek. (S1, ep 1).

Cornwall Part Two: Andy is back in Cornwall searching for legends, meeting a real-life mermaid and fishing for Cornwall's infamous sea serpent Morgawr. (S1, ep 3).

Hadrian's Wall: Rick Edwards joins YouTuber and detectorist Beau Ouimette on an underwater hunt to discover the secrets of Hadrian's Wall. (S1, ep 5).

Aliens And Robots: Experts investigate ancient tales and accounts of robots. If these sophisticated machines did exist in bygone days, what might have happened to them? (S8, ep 1).

Aliens B.C: Experts investigate whether the stories of a time when gods and otherworldly beings inhabited the planet are more than mere mythology. (S8, ep 2).

The Charnley Clues: An indigenous woman's testimony claims to know where Slumach found his gold. After returning from the expedition empty-handed, a vision has Kru rattled. (S1, ep 2).

Devon: Andy explores an ancient cavern, takes a tour of Dartmoor's prison museum and uncovers the legend behind Arthur Conan Doyle's 'The Hound of the Baskervilles'. (S1, ep 4).

Chichen Itza: Believed to have been constructed by the Mayan community roughly 1,500 years ago, the world-famous structure has fascinating secrets to tell. (S1, ep 7).

Ile de France: The pride of France after saving many lives and surviving World War II, this groundbreaking ship was ultimately used and destroyed in a disaster film. (S2, ep 6).

The Japanese Super Code: The Japanese Super Code reveals the US efforts to crack Japan's unbreakable WWII code following the horror of the attack on Pearl Harbor. (S1, ep 3).

Skyfall: Exploring why the Celts moved from prosperous cities into smaller fortified settlements and how this triggered their decline in Central Europe. (3 of 3).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 3).

A team of experts investigate some of the most well-known UFO cases of the last 75 years, hoping to uncover the truth. (S1, ep 2).

Communication: The need for expression goes to the core of humanity. Take a trip from communication's origins to the creation of the first alphabet and the earliest newspaper.

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 5).

Party Animals: Get to know the mega-millionaires who hosted parties so lavish and luxurious that they are still being talked about to this day. (S1, ep 1).

Epic Collections: When you're one of the richest people to ever live, no price is too high to pay for an object of desire - no matter how expensive or strange it may be. (S1, ep 2).

Aliens And Robots: Experts investigate ancient tales and accounts of robots. If these sophisticated machines did exist in bygone days, what might have happened to them? (S8, ep 1).

Aliens B.C: Experts investigate whether the stories of a time when gods and otherworldly beings inhabited the planet are more than mere mythology. (S8, ep 2).

Mary I: Bloody Mary: Professor Alice Roberts explores the death of the infamous Bloody Mary, who experienced phantom pregnancies in her desperation for a child and heir. (S2, ep 2).

Cardiff: Dan Jones explores the history of Cardiff castle over more than 2,000 years and reveals how it transformed into a lavish Victorian home. (2 of 5).

Ile de France: The pride of France after saving many lives and surviving World War II, this groundbreaking ship was ultimately used and destroyed in a disaster film. (S2, ep 6).

The Japanese Super Code: The Japanese Super Code reveals the US efforts to crack Japan's unbreakable WWII code following the horror of the attack on Pearl Harbor. (S1, ep 3).

NASA's Secret Agenda: Experts investigate whether rocket scientist Wernher von Braun might have found inspiration in technology found at the alleged UFO crash in Roswell. (S8, ep 3).

Alien Evolution: A look at the accounts of modern-day alien abductees. Plus, could the bizarre Paracas skulls discovered by Julio Tello be of extraterrestrial origin? (S8, ep 5).

The Charnley Clues: An indigenous woman's testimony claims to know where Slumach found his gold. After returning from the expedition empty-handed, a vision has Kru rattled. (S1, ep 2).

Devon: Andy explores an ancient cavern, takes a tour of Dartmoor's prison museum and uncovers the legend behind Arthur Conan Doyle's 'The Hound of the Baskervilles'. (S1, ep 4).

Barnard Castle: Rick and Beau discover a variety of intriguing items as they search the rough waters of the River Tees for lost Tudor relics. (S1, ep 6).

NASA's Secret Agenda: Experts investigate whether rocket scientist Wernher von Braun might have found inspiration in technology found at the alleged UFO crash in Roswell. (S8, ep 3).

Alien Evolution: A look at the accounts of modern-day alien abductees. Plus, could the bizarre Paracas skulls discovered by Julio Tello be of extraterrestrial origin? (S8, ep 5).

The Search For Volcanic Brown: Volcanic Brown is the most credible link to gold in the upper pit. Dig into the prospector's story, why he went missing and what he may have found. (S1, ep 3).

Somerset: Andy searches for dragons in Somerset, visits the grave of Arthur and Guinevere and tests the healing waters of a spring once used to wash the Holy Grail. (S1, ep 5).

Bermuda Triangle: With a famous reputation for mysteriously swallowing boats, ships and even planes, the Bermuda Triangle has haunted tales for generations. (S1, ep 8).

Shipwrecked Sailors of the Roman Empire: Kevin Sempé dives in search of wrecks harking back to the Roman Empire. The journey begins with the Nave Romana. (S2, ep 1).

The Lost Civilization: Decoding a lost civilization reveals the monumental challenge undertaken by some of the academic world's most brilliant minds. (S1, ep 4).

Daddy's Maverick: A filthy 1981 Camaro Z28 needs a major transformation to get it back on the road and a 1972 Ford Maverick with sentimental value must be revitalised. (S1, ep 1).

Goat Mobile: A minivan bursting at the seams with melted crayons, hay and trash has to be scrubbed, decontaminated and sanitised to be returned to its former glory. (S1, ep 2).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 4).

The Time Travelers: Explore whether time travel has already occurred - deliberately or by accident - and meet the scientists who believe it is theoretically possible. (S4, ep 1).

Tales of the Tormented: Throughout history, tales of inexplicable maladies have stirred morbid curiosity - from mysterious wounds to a madness that compels people to dance. (S4, ep 5).

Henry IV: The Usurper: Best known for usurping and murdering his cousin, Henry IV suffered from a mysterious debilitating skin condition during the later years of his reign. (S2, ep 3).

Experts investigate why so many UFO sightings take place in Los Angeles, determining that the answer may lie underwater. (S1, ep 3).

NASA's Secret Agenda: Experts investigate whether rocket scientist Wernher von Braun might have found inspiration in technology found at the alleged UFO crash in Roswell. (S8, ep 3).

Alien Evolution: A look at the accounts of modern-day alien abductees. Plus, could the bizarre Paracas skulls discovered by Julio Tello be of extraterrestrial origin? (S8, ep 5).

SS Clare Lilley: For decades, residents in Nova Scotia have reported munitions washing up on their shores - believed to have come from the wreck of the SS Clare Lilley. (S1, ep 4).

York: Dan explores the history of York's castle, from the Viking Jorvik and the Normans, to the dark days of the anti-Jewish pogrom and the imprisonment of the Knights Templar. (3 of 5).

An Air Force Police Officer sees a strange aircraft near a shimmering light before developing skin cancer. Were the events related? Later, a staff sergeant sees a shadowy figure. (S1, ep 1).

The Lost Civilization: Decoding a lost civilization reveals the monumental challenge undertaken by some of the academic world's most brilliant minds. (S1, ep 4).

The Other Earth: Ancient Alien theorists explore world mythology as they investigate whether extraterrestrials could be responsible for our existence. (S8, ep 6).

Creatures Of The Deep: Experts investigate whether alien life forms are thriving in our seas, following Russian cosmonauts' discovery of living plankton in space. (S8, ep 7).

The Search For Volcanic Brown: Volcanic Brown is the most credible link to gold in the upper pit. Dig into the prospector's story, why he went missing and what he may have found. (S1, ep 3).

Somerset: Andy searches for dragons in Somerset, visits the grave of Arthur and Guinevere and tests the healing waters of a spring once used to wash the Holy Grail. (S1, ep 5).

Durham: Rick and Beau head to the beautiful River Wear, a natural fortress that protects the ancient city of Durham, and discover some intriguing relics from the 1200s. (S1, ep 7).

The Other Earth: Ancient Alien theorists explore world mythology as they investigate whether extraterrestrials could be responsible for our existence. (S8, ep 6).

Creatures Of The Deep: Experts investigate whether alien life forms are thriving in our seas, following Russian cosmonauts' discovery of living plankton in space. (S8, ep 7).

The Prospector's Secret: Clues revealed in Katzie First Nation history lead the team north. Kru discovers 100-year-old court documents that shed light on Slumach himself. (S1, ep 4).

Wiltshire: Andy explores Wiltshire's mysterious megaliths and barrows, visits a medieval meadery and encounters a religious pilgrimage at the site of a freshly made crop circle. (S1, ep 6).

Genghis Khan: Was Genghis Khan really buried in an unmarked grave? And was anyone who knew its location killed to keep it a secret? (S1, ep 9).

The Last Hours of Saint-Pierre: Kevin explores the bay of Saint-Pierre in Martinique, where ships smouldered and sank following the volcanic eruption of 1902. (S2, ep 2).

The Gang Code: Experts reveal the highly encrypted phones that criminal gangs use to stay under the radar, and explain how the police are turning the phones against the crooks. (S1, ep 5).

The Snake Pit: A waterlogged Jeep Cherokee requires a major rescue after years of neglect and a snake-infested Plymouth Duster needs a new lease of life. (S1, ep 3).

Rat Pack-ard: A Packard filled with dead rodents must be given a makeover to make a profit. A neglected 1989 Porsche Carrera covered in grime needs to be handled with care. (S1, ep 4).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 5).

Vikings, Inca, Tel Banat: Dive deep into the ancient cultures of the Vikings, the Incan Empire and Tel Banat to reveal how their people treated their dead. (S1, ep 3).

Mysteries of the Oseberg: A preserved Viking ship was found in Norway in 1903. Buried with the ship were two skeletons, but does the evidence point to a sacrifice or a funeral? (S1, ep 4).

The Invaders: In a world void of people, pythons begin to challenge alligators for control of the Everglades. Elsewhere, Shanghai sinks under the weight of its empty skyscrapers.

Elevator from Hell, Pediatric Predator, the Visitor: A security guard witnesses two ghosts, a nurse faces a spirit in an old hospital, and long-slumbering ghosts suddenly awaken. (S1, ep 5).

The Other Earth: Ancient Alien theorists explore world mythology as they investigate whether extraterrestrials could be responsible for our existence. (S8, ep 6).

Creatures Of The Deep: Experts investigate whether alien life forms are thriving in our seas, following Russian cosmonauts' discovery of living plankton in space. (S8, ep 7).

The Costa Del Crime: When a century-old extradition treaty between Britain and Spain ended in 1978, the Spanish Coast became a safe haven for the mafia and criminal masterminds. (S1, ep 4).

Leeds: Dan Jones explores the 900-year history of the beautiful Leeds Castle in Kent, from its origins as a royal Saxon family's manor to a 20th-century retreat for the rich. (4 of 6).

US Navy Seaman Jesse Castillo sees a boy appear and disappear in Italy, while Military Police Officer Auburn White finds herself levitating after falling asleep. (S1, ep 2).

The Gang Code: Experts reveal the highly encrypted phones that criminal gangs use to stay under the radar, and explain how the police are turning the phones against the crooks. (S1, ep 5).

Circles from the Sky: Crop circles are a global phenomenon, with 10,000 seen worldwide. But are these strange patterns simply a hoax or could they be proof of UFO activity? (S8, ep 8).

The Alien Wars: Experts investigate whether the US military has a secret space programme, as well as evidence suggesting alien races have been in conflict for millennia. (S8, ep 9).

The Prospector's Secret: Clues revealed in Katzie First Nation history lead the team north. Kru discovers 100-year-old court documents that shed light on Slumach himself. (S1, ep 4).

Wiltshire: Andy explores Wiltshire's mysterious megaliths and barrows, visits a medieval meadery and encounters a religious pilgrimage at the site of a freshly made crop circle. (S1, ep 6).

Salisbury: It's the River Avon for Rick and Beau's final stop of the series, where they stumble upon some Roman coins in their search for William the Conqueror's legacy. (S1, ep 8).

Circles from the Sky: Crop circles are a global phenomenon, with 10,000 seen worldwide. But are these strange patterns simply a hoax or could they be proof of UFO activity? (S8, ep 8).

The Alien Wars: Experts investigate whether the US military has a secret space programme, as well as evidence suggesting alien races have been in conflict for millennia. (S8, ep 9).

The Mystery of Terrarosa Gold: Kru chases down a taped conversation with a man claiming to have found Slumach's gold deposit. Taylor attempts to decipher an old map. (S1, ep 5).

Gloucestershire: Andy receives military training at a Civil War re-enactment, before embarking on a ghostly hunt and meeting the man who captured leopard DNA from a sheep kill. (S1, ep 7).

Crystal Skulls: Were these fascinating skulls carved thousands of years ago by an ancient civilisation? Or are they proof that extraterrestrials visited the Aztecs? (S1, ep 10).

The True Story of the Pirates of the Caribbean: Kevin dives into the blue waters of the Caribbean to find relics from piracy's heyday in the region. (S2, ep 3).

The Cold War Code: A look at America's Cold War codebreakers charged with unravelling a seemingly uncrackable Soviet code and the uncovering of the Manhattan Project. (S1, ep 6).

Hurst So Good: A crusty old Pontiac Silver Streak must be taken from rags to riches, while an extremely rare but rusted Chrysler 300 Hurst needs an extensive polish and shine. (S1, ep 5).

Rolls to Riches: A forgotten Rolls-Royce gets the royal treatment and becomes a rolling beauty once more, while a Ford pickup is resurrected after being hidden in a barn. (S1, ep 6).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 6).

SS Atlantic: Uncover the story of the SS Atlantic's deadly 1873 crash through intriguing stories and 3D recreations of the wreck. (S1, ep 1).

Italy and the UK: Visiting a village in Calabria, Ross discovers the true extent of the mafia's powers - before meeting the daughter of an Italian mob boss. (S1, ep 5).

Day Of Days: America is on the offensive, but fighting on the Normandy beaches is ferocious and victory will not come quickly, especially for Lt Charles Scheffel. (5 of 10).

Nuclear Stand Off: A Greenpeace ship is bombed in 1985, killing Fernando Pereira. The French authorities deny responsibility and questions over nuclear restrictions arise again. (S2, ep 5).

Circles from the Sky: Crop circles are a global phenomenon, with 10,000 seen worldwide. But are these strange patterns simply a hoax or could they be proof of UFO activity? (S8, ep 8).

The Alien Wars: Experts investigate whether the US military has a secret space programme, as well as evidence suggesting alien races have been in conflict for millennia. (S8, ep 9).

Behind the Hunt: Head behind the scenes with Ton and Allen as they offer a crash course on how to win big at auctions. (S1, ep 9).

Lancaster: Dan Jones visits Lancaster Castle to explore its grisly history of crime and punishment, including the infamous Lancashire Witches trials. (5 of 6).

In Cyprus, a UN peacekeeper fights off deadly foe with the help of a mysterious power. Meanwhile, a strange presence is encountered at an Alaskan air force base. (S1, ep 3).

The Cold War Code: A look at America's Cold War codebreakers charged with unravelling a seemingly uncrackable Soviet code and the uncovering of the Manhattan Project. (S1, ep 6).

A Spaceship Made of Stone: The Ishi-no-Hoden megalith in Japan was supposedly built to depict an ancient flying ship. Could this have been an ancient alien vessel? (S10, ep 13).

Alien Discs: Hundreds of seemingly alien discs are found in China, only to be taken by the Chinese government and dismissed as a hoax. Is there more to the story? (S10, ep 14).

Return of the Gobekli Tepe: Experts examine the megalithic complex of Gobekli Tepe, and ask if such an advanced structure could possibly have been built by humans alone. (S10, ep 15).

The MOVE Bombing: The MOVE organisation rose up in 1970s Philadelphia. A unique blend of black power and flower power, their fight against police oppression escalated over time. (S1, ep 1).

Unexpected Discoveries: Using drones and satellite imagery, discover a vanished Neolithic structure in an Irish field, an oasis in a Chinese desert and buried treasure in the UK. (S1, ep 1).

A Spaceship Made of Stone: The Ishi-no-Hoden megalith in Japan was supposedly built to depict an ancient flying ship. Could this have been an ancient alien vessel? (S10, ep 13).

Alien Discs: Hundreds of seemingly alien discs are found in China, only to be taken by the Chinese government and dismissed as a hoax. Is there more to the story? (S10, ep 14).

Communication: The need for expression goes to the core of humanity. Take a trip from communication's origins to the creation of the first alphabet and the earliest newspaper.

Experts investigate why so many UFO sightings take place in Los Angeles, determining that the answer may lie underwater. (S1, ep 3).

The Psychograph, the Blood Mask and the Cursed Chicken Pot: Investigate a machine which can supposedly read personalities, a mask painted with human blood and a cursed pot. (S2, ep 4).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 4).

Communication: The need for expression goes to the core of humanity. Take a trip from communication's origins to the creation of the first alphabet and the earliest newspaper.

Experts investigate why so many UFO sightings take place in Los Angeles, determining that the answer may lie underwater. (S1, ep 3).

Bermuda Triangle: With a famous reputation for mysteriously swallowing boats, ships and even planes, the Bermuda Triangle has haunted tales for generations. (S1, ep 8).

The Sphere, the Prophecy Machine and the Canary: Examine claims Nostradamus predicted Hitler. Plus, learn about the canary resuscitator and a tiny object with the power to kill. (S2, ep 5).

The Moment of Truth: A salvage maestro returns to raise more valuable tropical hardwood, trying not to wreck his own boat in the process. (S1, ep 4).

The Game: Roberts and Laidlaw uncover a fatal flaw in the Royal Navy's anti-U-boat strategy and develop their own countertactic. Their next task is winning over the Admiralty. (S1, ep 4).

Body Image: Hitler held many secrets he went through great lengths to hide throughout his life. This episode reveals the truth about his drug addiction and genital deformity. (2 of 4).

A Spaceship Made of Stone: The Ishi-no-Hoden megalith in Japan was supposedly built to depict an ancient flying ship. Could this have been an ancient alien vessel? (S10, ep 13).

Alien Discs: Hundreds of seemingly alien discs are found in China, only to be taken by the Chinese government and dismissed as a hoax. Is there more to the story? (S10, ep 14).

Return of the Gobekli Tepe: Experts examine the megalithic complex of Gobekli Tepe, and ask if such an advanced structure could possibly have been built by humans alone. (S10, ep 15).

Sexspionage: As long as there has been espionage, sex and the promise of it have been powerful tools of persuasion and blackmail.

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 7).

Cops vs UFOs: Hear first-hand accounts from seasoned, decorated police officers who have had unbelievable, but substantiated UFO encounters. (S1, ep 1).

Da Vinci's Forbidden Codes: Researchers claim hidden messages can be found within the works of Leonardo da Vinci that may reveal an extraterrestrial influence. (S11, ep 2).

The Alien Protocols: In 2017, a strange, cigar-shaped object enters the solar system, causing some astronomers to suggest that it could be an extraterrestrial craft. (S11, ep 3).

Earth's Black Holes: Theorists speculate about the existence of black holes on Earth, which may explain strange disappearances and other inexplicable phenomena. (S11, ep 4).

Ruby Ridge: Randy and Vicki Weaver were involved in an 11-day siege after retreating to the mountainside of Ruby Ridge. Re-examine the deadly 1992 standoff which left two dead. (S1, ep 2).

Military Mysteries: Discover an array of mysterious phenomena seen from above, including a Nazi weapon in Northern France and a Russian military tower near Chernobyl. (S1, ep 2).

Da Vinci's Forbidden Codes: Researchers claim hidden messages can be found within the works of Leonardo da Vinci that may reveal an extraterrestrial influence. (S11, ep 2).

The Alien Protocols: In 2017, a strange, cigar-shaped object enters the solar system, causing some astronomers to suggest that it could be an extraterrestrial craft. (S11, ep 3).

A team of experts investigate some of the most well-known UFO cases of the last 75 years, hoping to uncover the truth. (S1, ep 2).

Vikings, Inca, Tel Banat: Dive deep into the ancient cultures of the Vikings, the Incan Empire and Tel Banat to reveal how their people treated their dead. (S1, ep 3).

Mysteries of the Oseberg: A preserved Viking ship was found in Norway in 1903. Buried with the ship were two skeletons, but does the evidence point to a sacrifice or a funeral? (S1, ep 4).

Nuclear Stand Off: A Greenpeace ship is bombed in 1985, killing Fernando Pereira. The French authorities deny responsibility and questions over nuclear restrictions arise again. (S2, ep 5).

A team of experts investigate some of the most well-known UFO cases of the last 75 years, hoping to uncover the truth. (S1, ep 2).

Vikings, Inca, Tel Banat: Dive deep into the ancient cultures of the Vikings, the Incan Empire and Tel Banat to reveal how their people treated their dead. (S1, ep 3).

Mysteries of the Oseberg: A preserved Viking ship was found in Norway in 1903. Buried with the ship were two skeletons, but does the evidence point to a sacrifice or a funeral? (S1, ep 4).

Top 10 Conspiracies Of All Time: Discover the secrets surrounding the ten biggest and most mysterious conspiracies in history, including the goings-on at Area 51. (S1, ep 12).

Remote Viewing: A look at the CIA's rumoured investment in psychological operations. Could there be an army of remote viewers watching American citizens today? (S1, ep 13).

Armageddon Battle Plan: In 1947, ancient scrolls were discovered in desert caves near the Dead Sea. One of them spells out - in chilling detail - a future apocalyptic war. (S1, ep 2).

Shoot 'Em Down: Fighter pilots from the UK to Peru have encountered UFOs. What happens when a UFO gets too close for comfort? (6 of 6).

In 1980, an Australian rancher witnesses a hovering UFO that shoots out a black tube-like object. A French biologist is left stunned when he spots a saucer-shaped craft in 1982. (S1, ep 11).

Teens on a Christian retreat spot an object land on a hill, emitting solid beams of light in 1972. In 1989, two Belgian police officers chase a triangular craft across fields. (S1, ep 12).

Da Vinci's Forbidden Codes: Researchers claim hidden messages can be found within the works of Leonardo da Vinci that may reveal an extraterrestrial influence. (S11, ep 2).

The Alien Protocols: In 2017, a strange, cigar-shaped object enters the solar system, causing some astronomers to suggest that it could be an extraterrestrial craft. (S11, ep 3).

Earth's Black Holes: Theorists speculate about the existence of black holes on Earth, which may explain strange disappearances and other inexplicable phenomena. (S11, ep 4).

Clandestine Collection: Methods for covertly capturing sensitive data have grown infinitely more advanced as the devices used to do so have become exponentially smaller.

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 8).

USOs: The team use high-tech sidescan sonar and deep sea magnetometers to search for evidence after learning of an encounter with an underwater phenomenon. (S1, ep 2).

The Forbidden Zones: Experts question whether the truth of our alien past could be buried in areas that, due to warfare or instability, are off-limits to exploration. (S8, ep 10).

The New Evidence: Specialists in the field of the extraterrestrial examine new evidence that suggests there was extraterrestrial intervention on Earth in the distant past. (S9, ep 1).

The Mystery of Terrarosa Gold: Kru chases down a taped conversation with a man claiming to have found Slumach's gold deposit. Taylor attempts to decipher an old map. (S1, ep 5).

Gloucestershire: Andy receives military training at a Civil War re-enactment, before embarking on a ghostly hunt and meeting the man who captured leopard DNA from a sheep kill. (S1, ep 7).

The Battle of Killiecrankie: The team find evidence from one of Scotland's bloodiest eras as they wade through the waters of the River Garry in the stunning Scottish Highlands. (S2, ep 1).

The Forbidden Zones: Experts question whether the truth of our alien past could be buried in areas that, due to warfare or instability, are off-limits to exploration. (S8, ep 10).

The New Evidence: Specialists in the field of the extraterrestrial examine new evidence that suggests there was extraterrestrial intervention on Earth in the distant past. (S9, ep 1).

The Troubling Tale of Bute Inlet Gold Pt. 1: The search for Slumach's gold sends the team 300 kilometres away into the heart of the mystery. (S1, ep 6).

Suffolk: Andy makes a startling discovery at the site of the Rendlesham UFO incident, before sending psychic Simi to investigate one of Britain's most haunted inns. (S1, ep 8).

Easter Island: Hundreds of years ago, a small group of Polynesians rowed across the open sea, navigating by the stars. But when - and why - did they leave their native land? (S1, ep 11).

USS Monitor, Clash of the Ironclads: Kevin goes diving in the Atlantic Ocean to explore a battleship that saved the Northern Navy in the American Civil War. (S2, ep 4).

The Code That Won the Great War: Revealing the encrypted German telegram could save Britain in its darkest hour. Can a team of geniuses decode the message in time? (S1, ep 7).

Nasty: A maggot-infested pickup crawls into the shop and rises from the dead before a vandalised Mercedes arrives on the scene. (S1, ep 7).

Boss for a Day: In North Carolina, Jaime lets Caleb take charge for the day. Meanwhile, in Minnesota, a beat up Chevy Impala gets all wrapped up and ready to roar. (S1, ep 8).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 4).

Quadzilla Attacks: Ton and Allen head to the Golden State, where a high-speed Quadzilla ATV awaits, along with a pair of assassin's guns and an 1880s palm squeezer. (S2, ep 1).

Sink or Swim: Ton and Allen's luck is in as they score a turn-of-the-century Thomas Edison gramophone and a tiny one-man boat designed for high-speed fun. (S2, ep 2).

Wales: The deeds of nobleman and warrior princes, including acts of treachery and vengeance, leave their stain within Wales' haunted castles. (3 of 4).

Stolen by the Knights Templar: Experts follow the trail of the elusive order of the Knights Templar - believed to have located and seized the Ark of the Covenant centuries ago. (S1, ep 5).

Giant Killer Snakes: Investigating reports of huge, man-eating snakes of 50 feet or more in length in Venezuela.

The Forbidden Zones: Experts question whether the truth of our alien past could be buried in areas that, due to warfare or instability, are off-limits to exploration. (S8, ep 10).

The New Evidence: Specialists in the field of the extraterrestrial examine new evidence that suggests there was extraterrestrial intervention on Earth in the distant past. (S9, ep 1).

Nuclear Stand Off: A Greenpeace ship is bombed in 1985, killing Fernando Pereira. The French authorities deny responsibility and questions over nuclear restrictions arise again. (S2, ep 5).

Arundel: Dan explores the history of the Earls of Arundel, how knights fought in the Hundred Years' War and how the Castle would have prepared for Queen Victoria's 1846 visit. (6 of 6).

A security officer is visited by an unearthly presence at a nuclear launch site, before waking up miles away. Meanwhile, a higher power seems to protect a US Army gunner. (S1, ep 4).

The Code That Won the Great War: Revealing the encrypted German telegram could save Britain in its darkest hour. Can a team of geniuses decode the message in time? (S1, ep 7).

Pyramids of Antarctica: Ancient Astronaut theorists suggest that aliens may have colonised an ice-free Antarctica, before a global event plunged it into the Ice Age. (S9, ep 2).

The Prototypes: Through history, mankind has credited its existence to otherworldly beings. Could this be true? Can any proof be found in these early beliefs? (S9, ep 3).

The Troubling Tale of Bute Inlet Gold Pt. 1: The search for Slumach's gold sends the team 300 kilometres away into the heart of the mystery. (S1, ep 6).

Suffolk: Andy makes a startling discovery at the site of the Rendlesham UFO incident, before sending psychic Simi to investigate one of Britain's most haunted inns. (S1, ep 8).

Viking Invasion: Rick and Beau embark on an epic search through the River Ouse in Yorkshire, in a bid to find evidence of Viking life. (S2, ep 2).

Pyramids of Antarctica: Ancient Astronaut theorists suggest that aliens may have colonised an ice-free Antarctica, before a global event plunged it into the Ice Age. (S9, ep 2).

The Prototypes: Through history, mankind has credited its existence to otherworldly beings. Could this be true? Can any proof be found in these early beliefs? (S9, ep 3).

The Troubling Tale of Bute Inlet Gold Pt. 2: The search for Slumach's gold continues as the team find themselves 300 kilometres away in search of answers to the mystery. (S1, ep 7).

Wales: Andy tracks down the site of the original Stonehenge, meets a childhood witness of Wales' most famous UFO incident and takes part in a comedic hunt for the Welsh Wildman. (S1, ep 9).

Nostradamus: The prophecies of Nostradamus, from the French Revolution to the rise of Adolf Hitler, have long piqued interest - and according to him, the world will end in 3797. (S1, ep 12).

The Mary Rose: Ross returns to training with dive master Neil Brock and explores the site of Britain's most famous wreck: the Mary Rose. (S1, ep 1).

The Human Code: Step foot on the roller-coaster ride that is cracking humanity's most complex and important code - the Human Genome. Season finale. (S1, ep 8).

Stinky Kitty: Jeremy and his team are confronted with a Mercury Cougar filled with over 15 years of cat urine. A Toyota 4Runner covered in dog hair finally gets groomed. (S1, ep 9).

Cockroach City: In Georgia, a cockroach-infested 1940s Ford goes from disgusting to deluxe, while a beat-up BMW transforms into a bright, shiny beamer in North Carolina. (S1, ep 10).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 8).

A team of experts investigate some of the most well-known UFO cases of the last 75 years, hoping to uncover the truth. (S1, ep 3).

Art and Culture: Renaissance painters sought to equal the art of the Egyptians, Greeks and Romans thousands of years earlier. What will future generations make of today's art.

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 6).

Expensive Tastes: Journey back in time and explore the world of the mega-rich gourmands, who spent epic sums in pursuit of the rarest, most forbidden food and drink could buy. (S1, ep 3).