A powerful union activist disappears from a Detroit suburb. 45 years later, it remains one of the most notorious missing person cases of all time. The mystery of Jimmy Hoffa's disappearance features more twists and turns than a Hollywood movie, but the question remains: where is he?

Thank you to our experts who contributed to this episode: Gregory Stejskal, Rebeca Salminen-Witt, James Buccellato, Scott Burnstein, Gary Jenkins, Marvin Elkind, and Phillip Moscato Jr.

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Sometimes the strangest things on Earth...Are happening just below its surface. From tunnels carved by giant sloths to desperate attempts to stop the dead from rising again - these are the weird and wonderous tales of the sea beasts, hidden cities and impossible creatures that lurk beneath us.

Thank you to our experts who contributed to this episode: Austin Rogers, Sabina Magliocco, Greg Jackson, Brandy Shillace, Mitch Horowitz, Kathleen Tracy, Cord Whitaker, Don Wildman, Joseph Dituri, Rebecca Lieb, Hakeen Oluseyi, David Mizejewski, Sami Jarroush, Jason Horton, Ramy Romany, and Kavitha Davidson.

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After a series of dark and ominous events, an unassuming family home on Long Island becomes the most notorious house in America. 50 years later, it’s spawned a title wave of books, documentaries, and films; but do haunted houses really exist? Who – or what – is really responsible for the Amityville horror?

Thank you to our experts who contributed to this episode: Laura DiDio, Anthony Holmes, Jason Horton, Eric Walter, John Tefft, Dr. Phani Tumu, and Loyd Auerbach.

If you’re new here, don’t forget to follow History’s Greatest Mysteries to never miss an episode! History’s Greatest Mysteries is a History Channel Original Podcast, brought to you by Rewind Studios.

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Listen to other Rewind Studios Originals, Hidden History and Government That Doesn’t Suck, wherever you get your podcasts!

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See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.