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Designed on the medieval model of forts with its enclosure and large corner towers, Chambord is France's largest and most iconic castle.

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.

Vera enlists Violette Szabo and Yvonne Baseden. With circuits failing and Noor at risk, treachery allegations harm preparations for the Allied invasion. (2 of.

Armed with evidence from Odette, Vera intensifies her search at Karlsruhe prison and Ravensbruck, facing hurdles to uncover crucial results in Germany.

France falls in 1940 and Donitz's U-boats embark on a race to sink British merchant ships. Roberts' wargaming ideas are at last entertained by a desperate Admiralty.

Headless Romans and Anglo Saxon Gold: Explore a gatehouse full of Civil War bullets, an Iron Age shield made from bark and Roman burials with pots where the heads should be.

Mystery Shipwreck and a Roman Army Camp: Alice Roberts reveals a Dutch ship sunk by the English, a Cornish Roman fort and a 5,000-year-old Neolithic monument.

Starting on the Isle of Lewis in the Outer Hebrides, witness the 5,000-year-old standing stones of Callanish, traditional Scottish blackhouses, and cut peat with a modern crofter. (2 of.

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 the Philippines, archaeologists discover the remains of an ancient rhinoceros. Elsewhere, a Brazilian island is infested with thousands of vipers.

In the northwestern Pacific, a tourist stumbles across a mysterious structure. Elsewhere, an unsettling sight is revealed on the island of New Guinea.

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.

Tori investigate the remains of children and teenagers found in Leeds city centre. The team reveals what life was like for the children of the Industrial Revolution.

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.

Survivors recount the horrors behind surviving a merciless place and hear the shock as they discover the evil secret of Germany's concentration camps.

The war in the Pacific nears its violent end as a drastic tactic triggers the nuclear age. The brave men share their thoughts on the war's most tragic events.

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