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Theorists ask whether a currently unidentified species represented in our DNA could be a result of breeding between humans and aliens in the remote past.

Experts question whether ancient myths provide evidence that reptillian aliens are more than just pop-culture creations and staples of science-fiction.

Explore the origins of history's deadliest games, from Roman bloodsports to Russian roulette.

Witness the dark origin stories behind some of history's most notorious methods of execution, from the guillotine to the electric chair.

Step foot on the roller-coaster ride that is cracking humanity's most complex and important code - the Human Genome. Season finale.

A Russian Infantryman sees mysterious lights in a Chechnyan forest, while an intrepid Air Force engineer investigates the government's cover-up of UFOs.

Ian Roussel doubles down and builds up with an off-road project.

A hoard of golden coins was found in the prospecting district of California. Where did they come from and why did the owners never claim them.

Millions mourned the death of Elvis Presley in 1977, but he's been spotted hundreds of times since.

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases.

At a mysterious site in the Gobi Desert, experts discover a monster graveyard - a groundbreaking find containing treasures of alien beasts.

The story of the World War II aircraft carrier USS Enterprise. Join her as she sets sail in the Pacific on a mission to sink enemy submarines.

We examine the robot that defused bombs both on foreign battlefields and British streets, and an astonishing Gulf War minelayer.

Could aliens have already landed on Earth? Experts visit the Texas cemetery believed to hold the body of a life form that crashed there in 1897.

Experts investigate why so many UFOs have been spotted near remote islands. Could these far-removed spots be the earthly homes of aliens.

In 1969, the US government officially announced it would stop investigating UFOs, but declassified documents seem to tell another story.

Did the space race stop at just the Moon? Is there any truth to rumours of a secret Space Force developed by America for missions beyond Earth's orbit.

Andy travels to Scotland, visiting the heart-rending doggy suicide bridge and learning about a terrifying family of cannibals who used to prey upon weary travellers.

A newly discovered town in Devon turns history on its head and there's a shocking find by the Thames - almost 100 baby skeletons.

A hoard of golden coins was found in the prospecting district of California. Where did they come from and why did the owners never claim them.

Millions mourned the death of Elvis Presley in 1977, but he's been spotted hundreds of times since.

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases.

At a mysterious site in the Gobi Desert, experts discover a monster graveyard - a groundbreaking find containing treasures of alien beasts.

The story of the World War II aircraft carrier USS Enterprise. Join her as she sets sail in the Pacific on a mission to sink enemy submarines.

We examine the robot that defused bombs both on foreign battlefields and British streets, and an astonishing Gulf War minelayer.

The remains of over 100 young Anglo-Saxon men are found under a planned car park in Hampshire.

The Japanese Super Code reveals the US efforts to crack Japan's unbreakable WWII code following the horror of the attack on Pearl Harbor.

Could aliens have already landed on Earth? Experts visit the Texas cemetery believed to hold the body of a life form that crashed there in 1897.