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Experts investigate the 'greys' - mysterious beings with big heads and eyes found carved into rocks. Who are these strange figures and what inspired them.

Did Mother Nature cause the volcanoes, earthquakes and floods of ancient times? Or could aliens have been responsible? Experts investigate.

In 1923, Adolf Hitler led the infamous Beer Hall Putsch, an attempt to take power in Germany by force. It was a day that would change the world forever, birthing Hitler's regime.

In the wake of the First World War, Adolf Hitler identifies Benito Mussolini as his model and has one ultimate goal: to gain power in Germany.

Craig and Sarah take on the Chicago O'Hare case of November 2006, a mass sighting of a flying saucer hovering over a United Airlines airport gate.

A look at the CIA's rumoured investment in psychological operations. Could there be an army of remote viewers watching American citizens today.

On 8 April 2011, the FBI declassified decades of top secret government documents for the first time. Here, experts examine the possibility of the end of the world.

At the midway stage of the competition, each competitor is tasked with creating a glass art centrepiece fit for a dining room table.

The stakes are raised as the final comes into view on the horizon. This episode sees the competitors design a perfume bottle with a sculpted stopper.

It was mankind's finest hour, the greatest technological achievement of the 20th century - the Apollo 11 mission to the Moon.

Do India's Sanskrit texts, with their descriptions of advanced technology, lend themselves to the theory that aliens once walked amongst us.

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

With the Allies at crisis point, pressure mounts on the Wrens to prove their worth and the stage is set for a battle that will turn the tide of the Atlantic war.

Capture of a key Nazi uncovers shocking realities. Amid demands for accountability, as Vera and her team navigate murky waters to confront uncomfortable truths.

It was mankind's finest hour, the greatest technological achievement of the 20th century - the Apollo 11 mission to the Moon.

Do India's Sanskrit texts, with their descriptions of advanced technology, lend themselves to the theory that aliens once walked amongst us.

Travelling east, Alice discovers a Roman barn conversion, unearthing a Tudor fort and finding intricately carved 10,000-year-old weapons.

Ice Age Camp and a Saint With Syphilis: Alice investigates an Ice Age camp, the mystery of a medieval skeleton and the earliest evidence of salt making in Britain.

Digs in northern Britain reveal a Roman emperor's lost bathhouse and a formidable fortress perched on top of a Scottish mountain.

Dr Alice Roberts examines an RAF air base with a Roman past and a pub with a very long history of hospitality in central England.

A Norman Panic Room and a Mesolithic Fish Trap: Alice explores the West of Britain, where some castles stand tall, while others have almost disappeared into the landscape.

Congressional UFOs, New Nessie and Zombie Fish: Dive into a video from the US Navy that proves once and for all that UFOs exist and examine an alleged Loch Ness monster sighting.

With the Allies at crisis point, pressure mounts on the Wrens to prove their worth and the stage is set for a battle that will turn the tide of the Atlantic war.

When humanity disappears, the global retail machine collapses. Malls rot and grocery stores become battlefields for rodents.

Alien Golden Orb, Yeti Caught On Tape, Las Vegas Close Encounter: Did a Las Vegas family have a close encounter with ten-foot-tall aliens in their backyard.

Leopard on the Loose, Plummeting to Earth, Elephant Attack & Balloon Chaos: A leopard goes on a rampage, a paraglider plummets to earth and a woman gets too close to an elephant.

It was mankind's finest hour, the greatest technological achievement of the 20th century - the Apollo 11 mission to the Moon.