25. Gardner Museum Robbery

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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.

24. The Black Dahlia

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It's one of the most infamous crimes in American history: the gruesome murder of a young beauty, unsolved for decades. There's a long line of suspects, each more mysterious than the next.

23. The Lost Gold of WWII

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During World War II, Japan plunders a fortune worth hundreds of billions of dollars.

22. The Hunt for Hitler

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Investigating the final days of WWII and the possibility of Hitler's escape.

21. TWA Flight 800

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In July 1996, one of the worst aviation disasters in American history leaves 230 people dead.

20. The Hunt for Cleopatra's Missing Tomb

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Cleopatra's body and final resting place have been lost without a trace for over 2,000 years.

19. Unlocking the Secrets of the Nazca Lines

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A look at 2,000-year-old geoglyphs made in the Peruvian desert that span over 50 miles.

18. The Mysterious Havana Syndrome

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Explore the top theories behind what caused the unexplained illnesses in US diplomats in 2017, later known as 'The Havana Syndrome'.

17. The Search For El Dorado

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For centuries, explorers put their lives on the line searching for the legendary ancient city of El Dorado, but will anyone ever find it?

16. Legend Of Bigfoot, The

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There have been thousands of alleged sightings of Bigfoot across the US. Despite growing evidence, the creature has never been officially identified.

15. The Legend of Bigfoot

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Thousands of people swear they've encountered this legendary North American creature, but Bigfoot has never been officially identified. As evidence continues to mount, and photos are scrutinized, the mystery endures: does Bigfoot really exist?

14. Who is D.B. Cooper?

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It's the only unsolved air piracy case in history. In 1971, a man hijacks a Northwest Orient Airlines flight, demanding 4 parachutes and $200,000. Can new evidence finally reveal the identity of the anonymous hijacker known as D.B. Cooper?

13. The Search For Noah's Ark

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Explore the most notable theories into the possible whereabouts of Noah's Ark, based on ancient accounts.

12. The Deadly Bermuda Triangle

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A look at the Bermuda Triangle, where ships, planes and travellers have been lost without a trace.

11. The Hunt for Stolen Nazi Treasure

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During World War Two, the Nazis stole vast amounts of art, gold, silver and currency.

10. The Puzzling Pyramids of Egypt

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The pyramids of Egypt are wonders of the ancient world, more than 4,000 years old.

9. Decoding the Mysterious Antikythera Mechanism

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An ancient mechanical device found on a 2,000-year-old shipwreck has become known as the world's first computer. The machine is centuries more advanced than historians thought possible, but its origin and true purpose are shrouded in secrecy.

8. Blackbeard's Lost Treasure

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One of history's most notorious pirates, Blackbeard, is said to have had a treasure worth millions of dollars. After centuries of searching, the legendary hoard remains missing.

7. The "Missingest" Man in America

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In 1930, a New York Supreme Court justice steps out of a steakhouse and disappears.

6. The Ark of the Covenant

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One of the holiest and most powerful relics from the Bible has been missing for over 2,000 years.

5. The Phoenix Lights Phenomenon

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In 1997, thousands of people across Phoenix witness a series of strange lights unlike anything they've ever seen. Could this be one of the largest-scale UFO sightings in history, or is there another explanation for this mysterious phenomenon?

4. The Lost Colony of Roanoke

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In 1587, a group of settlers land off the coast of North Carolina on Roanoke Island to establish the first English Colony in America. But only a few years later, the 115 men, women and children seemingly vanish without a trace, leaving only cryptic clues.

3. The Assassination of JFK

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On Nov 22, 1963, President John F Kennedy is assassinated, shaking the nation to its core.

2. Who Is the Zodiac Killer?

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New evidence and technology may be able to crack the code and discover who the Zodiac Killer is.

1. The Loch Ness Monster

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Despite centuries of sightings and searches, one of the most infamous deep-sea monsters remains unidentified. As evidence continues to mount, the mystery endures: does the Loch Ness Monster really exist? And if so, what could it be?

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