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Beyond the Breakers: Jeff and the team embark on a journey in pursuit of a cache of precious gemstones. But with bad weather closing in, can they find the wreck of the Neptune? (S1, ep 6)

Tomb of the Cosmic Bulls: Deep beneath the sands of Egypt lie 24 enormous, empty sarcophagi - but what purpose might these giant tombs have served? And are they even man-made? (S16, ep 17)

The Linda Moulton Howe Files: For over 40 years, award-winning journalist Linda Moulton Howe has covered mysterious phenomena - which could lead us to a profound new reality. (S16, ep 18)

Series investigating compelling UFO and alien cases by opening previously off-limits secret files. Does the mysterious Blue Planet Project hold the answers? (S1, ep 1)

Edinburgh: A look at one of Scotland's most popular paid tourist attraction. With a slew of sieges to its name, it is no surprise that the site boasts some formidable defences. (1 of 5)

Oldham, Greater Manchester: Hugh and the team uncover a World War Two prisoner of war camp beneath a housing estate in Oldham. Glen Mill held over six thousand enemy prisoners. (S3, ep 1)

The Disappeared: New theories shed light on the world's biggest mysteries, including the unsolved disappearances of aviator Amelia Earhart and hijacker DB Cooper. (S1, ep 1)

The Holy Sepulchre of Jerusalem: Uncover the secrets of the Holy Sepulchre, the sacred Christian site built in the same spot as the death and resurrection of Jesus. (S3, ep 1)

Strange Crime: A new and shocking theory could explain one of America's most famous unsolved crimes - the disappearance of aviator Charles Lindbergh's 20-month-old son. (S1, ep 7)

Outbreak: What would happen to Earth if all humans vanished? Outbreak examines the possibility of escaped animals, invasive vines and a deadly virus taking over control from humans.

Explore the mystery of a sunken fleet in Maryland, weird Arctic holes that NASA cannot explain and strange structures in the desert close to Area 51. (S5, ep 5)

Cambodian Civil War: From 1969 to 1973, US forces bomb Cambodia and the country falls into a brutal form of communism. Did the US' involvement pave the way for Pol Pot's regime? (S2, ep 7)

Destroyers And Cruisers: Discover the incredible story of USS Laffey, the WW2 destroyer that would come to be known as 'the ship that would not die'. (S2, ep 4)

The Top Ten Extraordinary Discoveries: Ten archaeological finds, including mysterious spheres and a lost city, challenge our views on human origins and extraterrestrial links. (S17, ep 1)

The Top Ten Mysterious Monoliths: Discover the top ten mysterious monoliths, from a 500-ton stone tied to UFOs to giant statues hinting at advanced tech and visitors. (S17, ep 2)

Recently declassified FBI files cast new light on the existence of aliens, as well as question whether the Vatican could be hiding proof of extra-terrestrial life. (S1, ep 2)

Cardiff: Dan Jones explores the history of Cardiff castle over more than 2,000 years and reveals how it transformed into a lavish Victorian home. (2 of 5)

King's Lynn, Norfolk: Hugh and the team solve a 17th-century mystery in King's Lynn as they hunt for defensive earthworks from the English Civil War. (S3, ep 2)

Strange Crime: A new and shocking theory could explain one of America's most famous unsolved crimes - the disappearance of aviator Charles Lindbergh's 20-month-old son. (S1, ep 7)

Outbreak: What would happen to Earth if all humans vanished? Outbreak examines the possibility of escaped animals, invasive vines and a deadly virus taking over control from humans.

Explore the mystery of a sunken fleet in Maryland, weird Arctic holes that NASA cannot explain and strange structures in the desert close to Area 51. (S5, ep 5)

Cambodian Civil War: From 1969 to 1973, US forces bomb Cambodia and the country falls into a brutal form of communism. Did the US' involvement pave the way for Pol Pot's regime? (S2, ep 7)

Destroyers And Cruisers: Discover the incredible story of USS Laffey, the WW2 destroyer that would come to be known as 'the ship that would not die'. (S2, ep 4)

Afghanistan 30 Years of War: Soviet troops withdraw from Afghanistan in 1989 after fighting a force funded by the US. Should the US be blamed for the rise of Islamic terrorism? (S2, ep 4)

The Brotherhood Is a Lie: Charles Peewee Goldsmith wanted nothing more than to be a Hells Angel. He fought to become a president, only for the Angels to turn on him. (S1, ep 4)

The Top Ten Extraordinary Discoveries: Ten archaeological finds, including mysterious spheres and a lost city, challenge our views on human origins and extraterrestrial links. (S17, ep 1)