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Spy Tech: Your government's most clandestine inventions are never what you would suspect and that's exactly why no one ever saw them coming. (S1, ep 9)

Aliens And Mysterious Rituals: Experts question whether the notion of rituals, such as funerals and festivals, was brought to earth by ancient extraterrestrial visitors. (S3, ep 5)

Aliens And Stargates: Experts investigate remote ruins, mysterious caves and legendary mountain portals. Could these alleged stargates have brought ancient aliens to Earth? (S6, ep 5)

UFO Photos: As the world continues to evolve into the digital age, more and more people are capturing images in the sky that they are unable to explain. (S4, ep 11)

UFOs from Earth: For years many have argued that UFOs are as terrestrial as you or I. They may be correct, but not in the way they thought they were. (S4, ep 12)

Devon: Andy explores an ancient cavern, takes a tour of Dartmoor's prison museum and uncovers the legend behind Arthur Conan Doyle's 'The Hound of the Baskervilles'. (S1, ep 4)

East: Alice Roberts and Matt Williams present more outstanding archaeology. In the east of Britain, sites include Must Farm, Colchester, Oakington, Lyminge and Silchester. (S3, ep 1)

Residents of a village reported seeing a statue of the Virgin Mary move, but some believe the phenomenon was just an optical illusion or a prank. (S1, ep 5)

The White House is one of the most-famous and most-haunted residences in the world. Experts investigate claims of extraordinary paranormal activity. (S1, ep 6)

Crushing it: Mike struggles to pick just 10 cars from his collection, while Shafin convinces Avery to clean up his yard with the help of a monster truck. (S4, ep 8)

Aliens & Superheroes: Experts investigate whether ancient tales of beings with super-human powers could be inspired by extra-terrestrials who came to Earth in the past. (S6, ep 13)

Tesla Experiment: Inventor Nikola Tesla claimed to have direct communication with beings on other planets. Could this genius scientist have been a human 'receiver'? (S6, ep 14)

Bombs, Bridges and Tunnels: We examine the robot that defused bombs both on foreign battlefields and British streets, and an astonishing Gulf War minelayer. (S1, ep 4)

Nuclear Near Miss: Machines that would have been used had a stand-off resulted in all-out nuclear war, from the smallest tactical nuke to an experimental flying jeep. (S1, ep 6)

Britannia: A newly discovered town in Devon turns history on its head and there's a shocking find by the Thames - almost 100 baby skeletons. (S2, ep 1)

Age of Bronze and Iron: Dr Alice Roberts discovers what Britain was like before the Romans as she examines fascinating finds from the Bronze and Iron Ages. (S2, ep 3)

Cornwall Part One: Andy embarks on a mission to unearth the Cornish sites of King Arthur, before magnet fishing for Excalibur and visiting the grave of a legendary witch. (S1, ep 2)

Cornwall Part Two: Andy is back in Cornwall searching for legends, meeting a real-life mermaid and fishing for Cornwall's infamous sea serpent Morgawr. (S1, ep 3)

Aliens & Superheroes: Experts investigate whether ancient tales of beings with super-human powers could be inspired by extra-terrestrials who came to Earth in the past. (S6, ep 13)

Tesla Experiment: Inventor Nikola Tesla claimed to have direct communication with beings on other planets. Could this genius scientist have been a human 'receiver'? (S6, ep 14)

The Missing: With Allied victories and the liberation of Paris following D-Day, Vera is in a race against time to locate her missing agents. (S1, ep 3)

The Quest for the Holy Grail: As the Third Reich rises to power, Himmler fixates on the Holy Grail as his and the Nazis' desperation to capture this ancient relic intensifies. (S1, ep 3)

Storming Mussolini's Island: It's July 10, 1943 and the Allied Forces have evicted the Axis Powers from North Africa and can finally begin the Italian Campaign. (S1, ep 3)

Hades: Discover the myth of ancient Greece's most feared god. Hades takes us behind the veil of the ancient Greek belief in life after death with chilling tales. (S1, ep 2)

Zeus: Ancient Greece's most powerful god wages an epic struggle against his father for control of the universe. It's the ultimate clash in what is mythology's greatest showdown. (S1, ep 10)

The Great Challenge: While the allies aim to end Hitler's domination of Western Europe, British troops are secretly being trained for an enormous, amphibious operation. (1 of 2)

The Bulge: Rewind to the US Army's largest and bloodiest conflict of World War II: The Battle of the Bulge. Venture through the battle in newly colourised footage. (S1, ep 5)

Aliens & Superheroes: Experts investigate whether ancient tales of beings with super-human powers could be inspired by extra-terrestrials who came to Earth in the past. (S6, ep 13)