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In a perfectly planned robbery, thieves steal half a billion dollars in masterpieces from the Gardner Museum in Boston; it's been three decades since the brazen heist, and an exhaustive search has failed to recover the stolen goods.

History's Greatest Mysteries

Gardner Museum Robbery

The gruesome murder of a young beauty goes unsolved for decades; there's a long line of suspects, each more mysterious than the next.

The Black Dahlia

During World War II, Japan plunders a fortune worth hundreds of billions of dollars from occupied countries, but to this day its whereabouts are unknown.

The Lost Gold of WWII

The history books say Adolf Hitler committed suicide in the final days of World War II, but not everyone believes there's sufficient proof; questions have swirled for decades about his possible escape.

The Hunt for Hitler

In July 1996, one of the worst aviation disasters in American history leaves 230 people dead and countless questions unanswered; it's a tragedy that changes the aviation industry forever.

TWA Flight 800

She was the last pharaoh of Egypt and one of the most famous queens of all time, but her death in 31 B.C. has been shrouded in mystery; Cleopatra's body and final resting place have been lost without a trace for over 2,000 years.

The Hunt for Cleopatra's Missing Tomb

UnexplJoin top investigators as they seek to uncover the truth behind some of the world’s greatest mysteries and cover-ups

UnXplained Zone

History - fascinating and exclusive programs on subjects ranging from American and world history to explorations of major events in politics, entertainment and social history.

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They've been called the world's greatest archaeological enigma: 2,000-year-old geoglyphs made in the Peruvian desert that span over 50 miles; the drawings are so massive, they can only be seen from the air.

Unlocking the Secrets of the Nazca Lines

In 2016, a mysterious illness strikes dozens of government officials in Cuba; hundreds more are afflicted.

The Mysterious Havana Syndrome

It is a legendary ancient city, said to be overflowing with gold; for centuries, explorers put their lives on the line searching for it; the quest to uncover this infamous city continues.

The Search for El Dorado

It's one of the most famous prehistoric monuments on Earth -- a mysterious arrangement of stones that have adorned the English countryside for millennia; nobody knows how the landmark was built or why.

Unlocking the Secrets of Stonehenge

Thousands of people swear they've encountered the legendary North American creature Bigfoot, but Bigfoot has never been officially identified; as evidence continues to mount, and photos are scrutinized, the mystery endures.

The Legend of Bigfoot

It's the only unsolved air piracy case in history; in 1971, a man hijacks a Northwest Orient Airlines flight, demanding four parachutes and $200,000; he jumps out of the plane with the money and is never seen again.

Who Is D.B. Cooper?

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Using new evidence to look at some of the most historically important mysteries of recent times.

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History HD reveals the power and passion of history as an inviting place where people experience history personally and connect their own lives to the great lives and events of the past.

S4 E19 | Unlocking the Secrets of the Nazca Lines