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Hear first-hand accounts from seasoned, decorated police officers who have had unbelievable, but substantiated UFO encounters.

Experts investigate strange carvings from 8,000 BC and unexplained sightings in the New World. Is there more to the US's past than history books suggest.

The Mutual UFO Network is devoted to the scientific investigation of UFOs. With more than five decades of investigations, MUFON's database could contain proof.

Alice heads to London to attempt to make sense of the world-changing events during the short but eventful Restoration period.

In 1963, President John F Kennedy is assassinated. A suspect is captured but investigators and amateur sleuths still investigate alternative theories.

Discover the beliefs held by ancient cultures concerning the reasons behind extraterrestrial visits to Earth, from a desire to understand us to thoughts of conquest.

Researchers claim hidden messages can be found within the works of Leonardo da Vinci that may reveal an extraterrestrial influence.

Weapons designed for everyone hand a sizeable advantage. Experts explore three weapons that are easily used: the crossbow, a pike and the Kalashnikov.

It was one of bloodiest battles in the history of warfare and a turning point in the conflict. This is the story of Stalingrad from a uniquely Russian perspective.

An exploration of the facts and myths surrounding the Soviet-era UFO research programmes at Kapustin Yar.

Locked away at Yale University is an extraordinary document that, if real, could rewrite the history of the world - simply known as the Vinland Map.

Coded Templar symbols lead the team to a monastery that may hold clues to the knights' ultimate survival as a secret organisation.

There are some events that are so destructive, so astounding, they must be directed by the hand of the Almighty.

Silchester is one of the best preserved Roman sites in Britain. Why did Rome's infamous emperor Nero stamp his mark on the town.

Alice Roberts explores Manchester's history of protest and rebellion during the Industrial Revolution, from Marx to the Suffragettes.

The Battle of the Teutoburg Forest: Rome never recovered after Arminius' tactics in the Teutoburg Forest. Many of the associated riddles are answered, but some remain unresolved.

Medusa is the most infamous female fiend in Greek mythology - whose look turned every living thing to stone. But what is the true story behind the myth.

Discover the beliefs held by ancient cultures concerning the reasons behind extraterrestrial visits to Earth, from a desire to understand us to thoughts of conquest.