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History's Greatest Mysteries is an American documentary television series that aired on the History Channel.

The 154 episodes of the series were produced from 1998 to 2011. Each season consisted of 12 to 14 one hour episodes that focused on historical events or subjects considered to be mysterious by the general public. Episodes typically begin with Kent giving a broad overview of the subject followed by what is commonly accepted as explanation. During the main segments, experts on both sides of the issue present their evidence and opinions. Before commercial breaks, Kent would give the audience bits of trivia relating to the subject; episodes also included a timeline which would give important events occurring around the time of the events discussed in the show. Subjects covered on the show ranged from the beginning of human history to modern subjects such as Carlos the Jackal, The Amityville Horror, and Area 51, as well as political conspiracies and conspiracy theories such as MK ULTRA and the JFK Assassination. Common aspects of history covered on the show include religion, crime, the supernatural, archaeology, mythology, and folklore. Some episodes of the show were repackaged as part of a series called "Incredible But True? ", which aired episodes of History's Mysteries as well as other shows (including In Search of History and UFO Files, also narrated by Ackroyd). The show's last episodes were an anthology of clips from previous episodes (such as Mysteries of the High Seas). Although new episodes are no longer being produced, re runs of History's Mysteries are regularly shown on the History Channel. Additionally, they are available on DVD.

Notes: (alternate name); some of these names are exactly the same as Decoding the Past episodes.

2. "The Shroud of Turin" (topic)
5. "The True Story of the Fighting Sullivans" (topic)
6. "The Search for Noah's Ark" (topic)
7. "Drake's Secret Voyage" (topic)
8. "The True Story of Mutiny on the Bounty" (topic)

7. "Secret Plunder: G. I. Looters" (topic)
8. "Raise the Hunley" (topic)

2. "Where's Jimmy Hoffa? : The Life and Disappearance of A Labor Legend" (topic)
3. "The Bloody Tower of London" (topic)
4. "Ghost Plane of the Desert: Lady Be Good" (topic)
10. "Amityville: Horror or Hoax? ": examines investigations, both credulous and skeptical, of the Amityville haunting (topic)

1. "Amityville: The Haunting" (topic)
5. "Hitler's Perfect Children" (topic)
9. "Natural Mummies" (topic)

6. "Vanished! ": discusses the mysterious disappearances of individuals during the 20th Century, including Judge Crater and D. B. Cooper. 8. "Alaska's Bermuda Triangle" Alaska natives say that shape shifting spirits kidnap lost travelers.

7. "The Spanish Armada"

1. "The True Story of Braveheart"
2. "The Hunt for Jack the Ripper"
3. "Amazon Women"
7. "Secret Societies"
8. "Exorcising the Devil"
10. "Crypts, Coffins and Corpses"

1. "Superstitions"
4. "Carlos the Jackal"
10. "Devil's Island: Hell on Earth"

2. "Silent Witnesses: The Kitty Genovese Murder"
3. "Vikings, Fury from the North"
4. "Smallpox: Deadly Again?" 5. "The Children's Crusade"
6. "The Inquisition"
7. "Samurai Warrior"
8. "The True Story of Rob Roy"
10. "Ancient Monster Hunters": The cyclops, Amazon warriors, and the ferocious griffin may have a place in the fossil record.

2. "Monsters of the Sea": Huge and mysteries sea animals breaking the surface have always been part of sailors' folklore. 3. "Nazi Bomb": How close were the Nazis to developing an atomic bomb? Focus on Werner Heisenberg's involvement in interviews with Hans Bethe. 16. "Contaminated: The Karen Silkwood Story"