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Throughout history, spiritual leaders known as shamans have healed, protected and advised. Could they really be in contact with extraterrestrial realms.

Could insects have descended from extraterrestrials? Experts investigate whether Earth's 10 quintillion critters could have dangerous links to aliens.

Was Leonardo Da Vinci, one of history's great thinkers also one of its greatest prophets? And did he envision world destruction.

New research and modern computer graphics shed light on our doomed future as forecast in centuries gone by. Can we avoid our fate by heeding these warnings.

At the end of 1939, the German Army invades Poland. Examine how Hitler succeeded in pushing through his rearmament and war plans relatively unhindered.

The King's Mask, the Nazi Plate and the Stonehenge Drums: Exploring the origin of a death mask, three carvings which could shed light on Stonehenge and a plate found in Austria.

During his time in charge, Himmler made the study of runes - letters of ancient Germanic writing - obligatory for SS officers in the belief they held powers.

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.

The story of one American GI and how he and his Harley motorbike became a legend.

Examining the machines used by the iconic military unit "The Desert Rats" in the North African desert campaign of World War 2.

During Italy's reconquest, the Allies faced the Winter Line and called in the First Special Service Force, elite troops trained for brutal terrain warfare.

An awe-inspiring year of archaeological digs with Dr Alice Roberts. Roman finds include an amazing coin hoard and a man buried on a pile of dead animals.

Humans are found to have lived in Britain earlier than thought when tools are unearthed in Norfolk, while some of our ancestors' customs are revealed at another dig.

Al is joined by Sanjeev Kohli as they visit Craufurdland Castle to explore the truth behind famous battles from the Wars of Scottish Independence.

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.

The most important planes in history are grounded with no humans around to fly them, including Air Force One, which suffers an explosive malfunction.

Gas leaks turn suburbs into infernos and high-rise apartments crumble to the earth in an ominous look at the fate that awaits our homes post-apocalypse.

A look at what could happen to the world underground, as minerals grow unchecked in a mine. Back on land, 400 million animals run wild in a town.

Venture back in time and explore the stories of some of history's most notable leaders, from Sir Winston Churchill to Fidel Castro and Nelson Mandela.

The Quest to Find the Tomb of Mary Magdalene: Experts look to uncover the truth behind the mystery of Mary Magdalene's life after witnessing the resurrection.

In 2012, the remains of King Richard III were discovered, offering unprecedented insight into the last moments of England's controversial monarch.

The Forgotten Queen: Professor Alice Roberts delves into the life and death of Anne, Queen of England from 1702-1714, who shockingly endured 17 failed pregnancies.

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.