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.

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Most people know it as the biblical birthplace of man: The Garden of Eden. But is the Garden of Eden just a story to explain human creation? Or could it be a real place? And if the Garden of Eden did exist... where exactly was it? Some of the possibilities may surprise you.

Thank you to our experts who contributed to this episode: Anthony Pin, Dominick Hernández, Esther Hamori, Nile Green, John A. Beck, Nicola Denzey Lewis, S. Joshua Swamidass, and Reza Aslan.

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It’s one of humanity’s oldest nightmares: at the full moon, werewolves that once were men hunt human prey and then feast on their flesh. Stories of this terrifying transformation persist to this day. Do real facts lie behind the enduring stories of werewolves?

Thank you to our experts who contributed to this episode: Andrew Patrick Nelson, Lynne McNeill, Troy Taylor, Ryan Golembeske, Kinitria D. Brooks, Erica Berry, and Brian A. Sharpless.

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Over seven hundred years ago, a medieval religious order protected a vast treasure of gold, silver, precious gems, and religious relics… and then it all mysteriously vanished. For centuries, historians and fortune hunters have crossed continents searching for these ancient riches, which would be worth billions today. What happened to the secret hoard of the Knights Templar?

Thank you to our experts who contributed to this episode: Cheryl H. White, Matthew Gabriele, Ammir Hussain, J. Stephen Roberts, Tony McMahon, Anthony Pinn, and Garth Baldwin.

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On February 14th, 1929, one of the most shocking murders in mob history goes down in Chicago... and becomes known as the Valentine’s Day Massacre. The 20s and 30s are full of gangland murders, but the Valentine’s Day Massacre is considered the most brutal, and the toughest to solve. So who carried out the Valentine’s Day Massacre? And why?

Thank you to our experts who contributed to this episode: Clarence Goodman, Claire White, Natalia Mehlman Petrzela, Mike King, Cheryl Dorsey, and Larry Dale Gragg.

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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