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The Mystery of Rudloe Manor: In the countryside of Wiltshire, England lies Rudloe Manor. A quaint manor house? Or epicentre of British UFO research since World War II? (S10, ep 1)

A team of experts investigate some of the most well-known UFO cases of the last 75 years, hoping to uncover the truth. (S1, ep 5)

Lenton, Nottingham: Hugh and the team unearth William the Conqueror's lost priory hidden beneath Lenton in Nottingham. (S1, ep 3)

The North: Discover the most incredible archaeology from the north of Britain, including Scotland's oldest railway and one of the best-preserved Norman castles. (S9, ep 3)

A Whole Lot of Holes: Explore some of the most cavernous places on the planet, including a mysterious Siberian crater and Greenland's bizarre black holes. (S2, ep 8)

In PEI, the guys hit a 70-mile garage sale set up clear across the island. While Sheldon eats fresh oysters, Scott searches for treasure. (S1, ep 4)

Decoding the Cosmic Egg: Ancient Astronaut theorists examine the creation myth of "The Cosmic Egg", and look at why the concept is so pervasive throughout the world. (S9, ep 4)

The Alien Architects: Why do many ancient architectural wonders bear similarities despite being built by different civilisations? Could aliens have designed them? (S10, ep 3)

Part One: Hear about the personal rivalry between Winston Churchill and Adolf Hitler, exploring how their exploits in World War I shaped their future commands. (1 of 2)

Treasure Island: Darrell and the team attempt a risky strategy when weather prevents them from diving from the boat. Meanwhile, Garth makes a solo journey to a deserted island. (S1, ep 4)

The Right Tools: Victory in war doesn't just require sound military strategy, vital resources and equipment are also critical. Discover how the Axis powers failed in this regard. (S1, ep 4)

Decoding the Cosmic Egg: Ancient Astronaut theorists examine the creation myth of "The Cosmic Egg", and look at why the concept is so pervasive throughout the world. (S9, ep 4)

The Alien Architects: Why do many ancient architectural wonders bear similarities despite being built by different civilisations? Could aliens have designed them? (S10, ep 3)

The face of Christ is discovered in a field in Hungary and a photo that claims to show who shot down a passenger jet in Ukraine. (S2, ep 5)

We investigate one natural phenomenon, four shapes that resemble human origin and monitor one example of human origin and current destruction. (S2, ep 6)

Satellite images could explain desert ruins rumoured to be an entrance to an underworld and a city-sized chunk of ice suddenly disappears in Antarctica. (S3, ep 1)

A giant carving of a strange creature suddenly appears in the Australian Outback and mysterious bright green lights illuminate the seas around Thailand. (S3, ep 2)

Strange black holes appear near Egypt's ancient pyramids and a mysterious red swarm invades a beach in India. (S3, ep3)

UFO vs Fighter Jet, Cosmic Question Mark and Highway 97 Bigfoot Howls: Was a UFO tracking an American fighter plane? The team of experts examines the evidence to find the truth. (S5, ep 6)

Treasure Island: Darrell and the team attempt a risky strategy when weather prevents them from diving from the boat. Meanwhile, Garth makes a solo journey to a deserted island. (S1, ep 4)

The Right Tools: Victory in war doesn't just require sound military strategy, vital resources and equipment are also critical. Discover how the Axis powers failed in this regard. (S1, ep 4)

Family Matters: The story of Hitler's dysfunctional home life. His parents were closely related, and in his adult years, he was rumoured to have engaged in incest himself. (3 of 4)

Hitler's Lovers: Discover the many lovers of Adolf Hitler - uncovering the unfortunate demise of all who dared resist his love, affection and sexual appetite. (S1, ep 4)

Decoding the Cosmic Egg: Ancient Astronaut theorists examine the creation myth of "The Cosmic Egg", and look at why the concept is so pervasive throughout the world. (S9, ep 4)