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The Forbidden Zones: Experts question whether the truth of our alien past could be buried in areas that, due to warfare or instability, are off-limits to exploration. (S8, ep 10)

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 3)

Benwell, Newcastle: Hugh and the team attempt to uncover a Roman fort, connected to Hadrian's Wall, that's buried beneath the back gardens of Benwell in Newcastle. (S1, ep 1)

East: Alice Roberts tours the East of England, seeking out the biggest archaeological digs of the year and witnessing the uncovering of a hugely significant Roman mosaic. (S9, ep 1)

Giants: Walk among colossal wonders scattered across the Earth's surface, including an ancient reptile skeleton, a massive head carving and a giant South African footprint. (S2, ep 6)

North of Calgary, the guys visit a prolific collector with plenty of outbuildings and a sprawling graveyard of historic cars that capture Scott's attention. (S1, ep 2)

Pyramids of Antarctica: Ancient Astronaut theorists suggest that aliens may have colonised an ice-free Antarctica, before a global event plunged it into the Ice Age. (S9, ep 2)

Forged by the Gods: Examining otherworldly artefacts as physical evidence of extraterrestrial visits, including a strange metal sphere that defies the laws of physics. (S10, ep 2)

The Shame of Returning Alive: As Soviet forces push back, Goebbels calls for total war amid the devastation of German cities from Allied bombers. (S1, ep 7)

Lost Nazi Artifacts: Treasure hunter Darrell Miklos' search for lost Nazi U-Boats takes an unexpected turn when a 98-year-old eyewitness gives him an incredible tip. (S1, ep 2)

The Best Laid Plans: Explore how the seeds of Japan's defeat in 1945 were sown a decade earlier with the occupation of Manchuria in China. (S1, ep 2)

Pyramids of Antarctica: Ancient Astronaut theorists suggest that aliens may have colonised an ice-free Antarctica, before a global event plunged it into the Ice Age. (S9, ep 2)

Forged by the Gods: Examining otherworldly artefacts as physical evidence of extraterrestrial visits, including a strange metal sphere that defies the laws of physics. (S10, ep 2)

Near the Czech border, a secret German site, "The Giant," tests The Bell, powered by Serum 525, turning all who touch it into rotting living zombies. (S3, ep 1)

1942 and Hitler has the totally barking idea of using educated dogs to do a soldier's job. The Nazi leader wants to create fearsome canines to help him win the Second World War. (S3, ep 2)

Russian designer Nikolay decided to engineer a solution to trench warfare with an armoured vehicle with wheels that could move over any terrain. (S3, ep 3)

Discover the true story of a German Luftwaffe pilot in World War II who risked his own life to save the crew of an American B-17 bomber. (S3, ep 4)

Nazi scientists conducted brutal experiments for an Aryan master race, while zoologists ran their own bizarre trials. (S3, ep 5)

Bigfoot Train Sighting, Jesus and Aliens and Iceland's Loch Ness Monster: Did a couple in Colorado spot Bigfoot from the window of a moving train? (S5, ep 3)

Lost Nazi Artifacts: Treasure hunter Darrell Miklos' search for lost Nazi U-Boats takes an unexpected turn when a 98-year-old eyewitness gives him an incredible tip. (S1, ep 2)

The Best Laid Plans: Explore how the seeds of Japan's defeat in 1945 were sown a decade earlier with the occupation of Manchuria in China. (S1, ep 2)

Montana Freeman Militia: Leroy Schweitzer breaks away from the US and takes advantage of everyone that decides to follow him, resulting in a prolonged armed standoff in 1996. (S1, ep 4)

Superweapons of Fear: From the world's largest trebuchet to Nazi super cannons, these are the deadly weapons that rain destruction and spread fear on the battlefield. (S1, ep 6)

Pyramids of Antarctica: Ancient Astronaut theorists suggest that aliens may have colonised an ice-free Antarctica, before a global event plunged it into the Ice Age. (S9, ep 2)