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Explore how Romania, Bulgaria, Hungary and the Baltic states came to be "Judenfrei" - meaning free of Jews - as a result of Nazi Death Squads in December 1941. (2 of.

Water gives life, but it can also destroy. Discover how, in a world without people, rain submerges New Orleans and corrosion topples Seattle's Space Needle.

Throughout time, people have believed mountains were the home of the divine. But could these hilltop spirits have been extraterrestrials.

Experts investigate creepy places associated with death. Could otherworldly connections be responsible for strange disappearances and suicides.

Can a site on the Lancashire-Yorkshire border shed more light on the Pendle Witch trials of 1612.

The River Hunters head to Canterbury, where they're granted special permission to undertake the first official search of this section of the River Stour.

Sacred buildings around the world begin to crumble without humans to maintain them. Clues about the planet's future lie in an abandoned desert town.

Bruno Tonioli joins Al to look at key battle tactics during the Roman Invasion back in AD 43.

A look at Mount Shasta in northern California, which is rumoured to be a hotbed of strange events and otherworldly visitors from Bigfoot to UFOs.

Could Area 51's notoriety act as a cover up to much bigger, top-secret extraterrestrial experiments taking place at multiple locations.

Mutant Mermaid, UFOs vs Nukes and Seamonster Chases a Boat: Is a dead mermaid really preserved in Japan? And are UFOs attracted to nuclear facilities.

The Jericho Head, the Cloudbuster and the Map: Examine a 9,000-year-old clay head, a 1950s machine built to control the weather and a map which could be the oldest ever found.

Bruno Tonioli joins Al to look at key battle tactics during the Roman Invasion back in AD 43.

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.

Could the Founding Fathers have hidden secrets about ancient aliens in their documents, buildings and symbols? Experts investigate.

Douglas Bader and the Duxford Fliers: Suggs and WWII expert Stephen hunt for souvenirs left by flying ace Douglas Bader and the legendary Duxford Fliers.

More clues to Henry VIII's life are unearthed as Helen Skelton and Alex Langlands join a new dig at one of nearly 60 royal residences owned by the monarch.

The team searches the sea for huge and aggressive albino sperm whales that inspired the novel Moby Dick.

The team heads into Midwestern forests to investigate werewolf sightings, recently uncovered film footage and new witnesses.

The Jericho Head, the Cloudbuster and the Map: Examine a 9,000-year-old clay head, a 1950s machine built to control the weather and a map which could be the oldest ever found.

A look back at some of the most daring and deadly war missions in WWII and the fearless airmen who undertook them.

Amazing CGI graphics tell the story of how the USS Enterprise and sister carriers Yorktown and Hornet turned the tide of the Pacific battle during WWII.

The Zodiac Killer Code reveals the desperate bid to crack the crazed codes sent by America's most mysterious serial killer.

True stories from WWII. As Lt Charles Scheffel leads his unit across France, Marine Nolen Marbrey is wounded in the bloody battle of Peleliu in the Pacific. (6 of.

Explore how the seeds of Japan's defeat in 1945 were sown a decade earlier with the occupation of Manchuria in China.

Sacred buildings around the world begin to crumble without humans to maintain them. Clues about the planet's future lie in an abandoned desert town.