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Aliens in Our Airspace: Eerie encounters at 40,000 feet, accounts of UFOs taking control of aircraft, and jumbo jets disappearing. Is this proof of aliens in our airspace? (S15, ep 9)

The Giants of Malta: Could the megalithic structures of Malta - and an underground complex housing otherworldly remains - be linked to local legends of alien visitation. (S15, ep 10)

Chicago: Craig and Sarah take on the Chicago O'Hare case of November 2006, a mass sighting of a flying saucer hovering over a United Airlines airport gate. (S1, ep 7)

Stewart Sturling: Alice explores the story of Stewart Britain by visiting the home of the Scottish royals who eventually took the English throne in 1603 and created Great Britain. (6 of 6)

Game of Thrones: Archaeologists conduct a dig at Auckland Castle in Co Durham, which 700 years ago was home to a group of power-crazed bishops. (S2, ep 4)

Man Overboard!: Ian goes over the top when he gets to work on a wild creation. (S7, ep 3)

The Inca: Investigate the mighty Inca Empire and its accomplishments, including the construction of their awe-inspiring buildings in Cusco and Machu Picchu. (S2, ep 10)

Travel to the richest country on the planet, take a tour of a mind-blowing hotel in Italy, visit a chicken-shaped church in Indonesia and discover the hidden world under Moscow. (S1, ep 13)

Graveyard Hogs: Something is drawing ravenous wild hogs to an ancient cemetery, luring them to unearth graves that date back over 200 years. (S3, ep 2)

Evidence might finally identify the hiding place of the billion-dollar Nazi gold train and blood-red river in Siberia points to catastrophic pollution. (S4, ep 11)

Jaws Of The Enemy: The American Navy is on the offensive and the first strike is on the Solomon Islands. Join the USS Enterprise as it supports the first American invasion. (S1, ep 3)

Leopard Tiger: The Leopard 2 is probably the best all-around Main Battle Tank today, combining great mobility, a superior gun and excellent protection. (S1, ep 8)

The Top Ten Pyramid Sites: Count down the world's top ten pyramid sites, from hidden structures in Peru to the famous landmarks of Giza in Egypt. (S15, ep 11)

The Top Ten Mysterious Devices: Count down the top 10 mysterious devices found around the world, from strange discs found in a cave in China to an ancient Greek computer. (S15, ep 12)

Alan Godfrey/'Abductions': Craig and Sarah look at the Yorkshire case of Alan Godfrey, who was allegedly abducted by a UFO. Godfrey underwent hypnosis in support of his claim. (S1, ep 8)

Medieval Lincoln: Alice is in Lincoln, getting to grips with life in medieval England. She visits the magnificent cathedral that was once the tallest building in the world. (S3, ep 1)

The Industrial Revolution: The team search for artefacts from the country's first superhighway - the Bridgewater Canal. (S2, ep 5)

Travel to the richest country on the planet, take a tour of a mind-blowing hotel in Italy, visit a chicken-shaped church in Indonesia and discover the hidden world under Moscow. (S1, ep 13)

Graveyard Hogs: Something is drawing ravenous wild hogs to an ancient cemetery, luring them to unearth graves that date back over 200 years. (S3, ep 2)

Evidence might finally identify the hiding place of the billion-dollar Nazi gold train and blood-red river in Siberia points to catastrophic pollution. (S4, ep 11)

Jaws Of The Enemy: The American Navy is on the offensive and the first strike is on the Solomon Islands. Join the USS Enterprise as it supports the first American invasion. (S1, ep 3)

Leopard Tiger: The Leopard 2 is probably the best all-around Main Battle Tank today, combining great mobility, a superior gun and excellent protection. (S1, ep 8)

The search for missing mountaineer Janet Mae Johnson, from 1973, gains momentum with the discovery of her backpack and camera in 2020. (S4, ep 1)

The First Barbarian War: Follow the story of General Marius, who transformed the Roman army and sent shock waves through Rome by offering dictatorship or annihilation. (S1, ep 1)

The Top Ten Pyramid Sites: Count down the world's top ten pyramid sites, from hidden structures in Peru to the famous landmarks of Giza in Egypt. (S15, ep 11)