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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)

Abductions: This episode chronicles several close encounters with alien abductees who have been held captive, probed, examined and had objects implanted in their bodies. (S1, ep 5)

Canterbury Murder: The River Hunters head to Canterbury, where they're granted special permission to undertake the first official search of this section of the River Stour. (S2, ep 4)

Elizabeth: In 1592, Elizabeth I visited Sudeley Castle where a spectacular garden was created. 500 hundred years later, a team of archaeologists hunt for this lost gem. (S2, ep 1)

Ecuador's Mountain Mystery: Human remains are discovered high in the Ecuadorian Andes, while a strange earthquake-like event is investigated in Canada. (S3, ep 4)

Mining for Gold: The guys get creative when they visit an eccentric dealer who keeps most of his treasures rusting outside. Scott and Sheldon buy two mystery trunks sight unseen. (S2, ep 7)

Island of the Giants: Oak Island treasure hunter Marty Lagina and Ancient Astronaut theorist Giorgio A. Tsoukalos explore the ancient ruins of Sardinia, Italy. (S11, ep 7)

The Sentinels: Seven stone giants stand guard over a Pacific island. But what are they protecting? And from whom? (S11, ep 9)

Faster Than The Enemy: Speed has become a decisive feature in war's evolution: from the chariot that brought greater mobility to small handguns like Samuel Colt's revolver. (S1, ep 5)

Discover WWII's most daring breakout stories of courage and cunning: Colditz Castle, The Great Escape and the bold Warburg Wire Job. (S1, ep 1)

Rise of the Bomber: The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (1 of 6)

Island of the Giants: Oak Island treasure hunter Marty Lagina and Ancient Astronaut theorist Giorgio A. Tsoukalos explore the ancient ruins of Sardinia, Italy. (S11, ep 7)

The Sentinels: Seven stone giants stand guard over a Pacific island. But what are they protecting? And from whom? (S11, ep 9)

Cold War Warriors: Exploring the Cold War vessels that played pivotal roles in events such as the blockade of Cuba and the Vietnam war. (S1, ep 6)

Rescue Ships: Stories of hospital ships and those who served on them, including the tragic story of the sinking of the Titanic's sister vessel, The Britannic. (S1, ep 7)

The Smallest Ships of War: Ships don't have to be large to make history, like the 1776 gunboat built to stop a British invasion, or the remarkable story of the HA-19 sub. (S1, ep 8)

Mighty Wooden Warships: We learn about life on a Tudor ship from objects found on the Mary Rose, while on HMS Victory we learn the battle-winning tactics of Admiral Nelson. (S1, ep 9)

Secrets and Lies: A look at the tactics employed to pass strategically important ships under the nose of the enemy, and the use of intelligence to carry out naval attacks. (S1, ep 10)

Alien Sabotage, Ghost Child and Hungry Hungry Sasquatch: Strange creatures are encountered and a home security video may be proof that UFOs are messing with technology. (S3, ep 20)

In 1923, Adolf Hitler led the infamous Beer Hall Putsch, an attempt to take power in Germany by force. It was a day that would change the world forever, birthing Hitler's regime.

Discover WWII's most daring breakout stories of courage and cunning: Colditz Castle, The Great Escape and the bold Warburg Wire Job. (S1, ep 1)

Killer Finds: A deadly discovery hiding under one of America's most national parks, a Nazi era weapon sunk off the coast of New Jersey. (S1, ep 6)

Mysterious Sacred Structures: The history and perplexing mysteries behind some of the world's most sacred and holy relics. (S1, ep 7)

Island of the Giants: Oak Island treasure hunter Marty Lagina and Ancient Astronaut theorist Giorgio A. Tsoukalos explore the ancient ruins of Sardinia, Italy. (S11, ep 7)