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Recently declassified FBI files cast new light on the existence of aliens, as well as question whether the Vatican could be hiding proof of extra-terrestrial life.

Some believe a UFO was shot down by the RAF above South Wales in 2016. Craig and Sarah examine the evidence as they try to discover if it was an extra-terrestrial event.

Craig and Sarah take a look at a case from November 2018 off the coast of Ireland, in which pilots saw bizarre lights through their cockpit windows.

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.

The Search for the Loch Ness Monster: Andy joins a team of Nessie experts to carry out the biggest search for the Loch Ness Monster in 50 years.

Dan ventures behind the battlements of Dover Castle, exploring the underground lairs and a vast network of tunnels that have been used to defend the country for centuries.

Dan explores the turbulent history that took place within the well-preserved walls of Warwick Castle, touching on tales of betrayal, bloodshed, murder and financial woe.

Discover a massive tsunami hundreds of feet high that never touches land and an image from space may have revealed the location of the Garden of Eden.

Discover an island the size of Manhattan that vanishes without a trace and a lost city in the heart of the Amazonian jungle.

A look at the possibility that life began on Mars and travelled to Earth. Plus, if aliens exist, what plans do they have in store for us? Experts investigate.

Experts open previously off-limits files in a bid to answer some of the most mysterious questions surrounding UFOs and extra-terrestrial life.

What is the Voynich Manuscript, and what secrets does the mysterious 500-year-old document hold.

Experts investigate whether a controversial union leader's disappearance is linked to the mob or if he went missing on his own accord.

A new report is made every 55 hours in Washington state, which is America's highest rate of UFO sightings per capita - but why are UFOs choosing to hover here.

Annually, Illinois gets more than 300 UFO reports, so why are the Tinley Park sightings - with over 70 witnesses each year - the only reports that happen en masse.

Documentarian Seth Breedlove joins groups like the North American Wood Ape Conservancy and the Ohio Night Stalkers, seeking evidence of the existence of Bigfoot.

From missing World War II aircraft to a frozen lake filled with human remains, take a look through how and why humans have become frozen in time.