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The Alien Protocols: In 2017, a strange, cigar-shaped object enters the solar system, causing some astronomers to suggest that it could be an extraterrestrial craft. (S11, ep 3)

Earth's Black Holes: Theorists speculate about the existence of black holes on Earth, which may explain strange disappearances and other inexplicable phenomena. (S11, ep 4)

Alien Contact: For years, people have claimed to have had direct, personal contact with aliens. The team tracks down some of those who claim to have had such contact. (S1, ep 4)

Scotland and the Civil War: The River Hunters head to the River Lochy in search for evidence of the clashing Scottish clans embroiled in the 17th Century civil war. (S2, ep 3)

Forgotten Fortresses And Lost Villages: Digs in western Britain uncover a forgotten fortress and a shocking discovery hidden beneath a Roman mosaic. (S11, ep 6)

Mysterious Mongol Massacre: Archaeologists in Russia find several mass graves, a World War II plane sits on a Canadian mountain and cosmic rays in Antarctica have stump experts. (S3, ep 3)

The Bet: The Pickers make a friendly wager to crisscross Newfoundland in search of the greatest piece of kitsch. In the process, they get a great history lesson on the area. (S2, ep 6)

The Desert Codes: Researchers study giant ancient drawings found etched into the desert floor, which may be a part of an ancient alien code. (S11, ep 5)

Area 52: Could Area 51's notoriety act as a cover up to much bigger, top-secret extraterrestrial experiments taking place at multiple locations? (S11, ep 6)

Weapons For All: Weapons designed for everyone hand a sizeable advantage. Experts explore three weapons that are easily used: the crossbow, a pike and the Kalashnikov. (S1, ep 4)

In 1944, D-Day pierces the Atlantic Wall, as Operation Bagration crushes the Wehrmacht in the East. The fall of the Third Reich begins. (S1, ep 4)

The Human Code: Step foot on the roller-coaster ride that is cracking humanity's most complex and important code - the Human Genome. Season finale. (S1, ep 8)

The Desert Codes: Researchers study giant ancient drawings found etched into the desert floor, which may be a part of an ancient alien code. (S11, ep 5)

Area 52: Could Area 51's notoriety act as a cover up to much bigger, top-secret extraterrestrial experiments taking place at multiple locations? (S11, ep 6)

When terrorists kidnap more than 200 schoolgirls in northern Nigeria, rescuers use satellites to track them down. (S3, ep 14)

New evidence could lead to the discovery of an unknown ancient civilization in the Amazon rainforest and an unidentified submarine is spotted in a North Korean shipyard. (S3, ep 15)

A giant chasm opens in Siberia, dubbed a gateway to the underworld. Meanwhile, an entire island mysteriously vanishes without a trace.

A bright green swirling spiral appears in the seas of the Persian Gulf and a massive complex suddenly appears in Myanmar. (S3, ep 17)

Strange images from a remote and empty desert could explain the mysterious mummies found there and an apocalyptic sandstorm swallows the Middle East. (S3, ep 18)

Mutant Mermaid, UFOs vs Nukes and Seamonster Chases a Boat: Is a dead mermaid really preserved in Japan? And are UFOs attracted to nuclear facilities? (S3, ep 19)

In 1944, D-Day pierces the Atlantic Wall, as Operation Bagration crushes the Wehrmacht in the East. The fall of the Third Reich begins. (S1, ep 4)

The Human Code: Step foot on the roller-coaster ride that is cracking humanity's most complex and important code - the Human Genome. Season finale. (S1, ep 8)

Walking with Witches: In Nazi Germany, questions about witchcraft attracted SS leaders. Himmler, dedicated to an Aryan super race, established a team to research witchcraft. (S1, ep 2)

Werner Heisenberg: As one of their most controversial scientists, Heisenberg was key in the Nazis' efforts to build an atomic bomb. How close was he to achieving his goal? (S1, ep 3)

The Desert Codes: Researchers study giant ancient drawings found etched into the desert floor, which may be a part of an ancient alien code. (S11, ep 5)