History's Greatest Mysteries Season 4 Episode 21
TWA Flight 800
4 - 25Gardner Museum RobberyAug. 14, 2023- 4 - 24The Black DahliaAug. 07, 2023
- 4 - 23The Lost Gold of WWIIJul. 31, 2023
- 4 - 22The Hunt for HitlerJul. 24, 2023
- 4 - 21TWA Flight 800Jul. 17, 2023
- 4 - 20The Hunt for Cleopatra's Missing TombJul. 10, 2023
- 4 - 19Unlocking the Secrets of the Nazca LinesJun. 26, 2023
- 4 - 18The Search for El DoradoJun. 05, 2023
- 4 - 17The Mysterious Havana SyndromeJun. 05, 2023
- 4 - 16Unlocking the Secrets of StonehengeMay. 29, 2023
- 4 - 15The Legend of BigfootMay. 22, 2023
- 4 - 14Who is D.B. Cooper?May. 15, 2023
- 4 - 13The Search for Noah's ArkMay. 08, 2023
- 4 - 12The Deadly Bermuda TriangleMay. 01, 2023
- 4 - 11The Hunt for Stolen Nazi TreasureApr. 24, 2023
- 4 - 10The Puzzling Pyramids of EgyptApr. 17, 2023
- 4 - 9Decoding the Mysterious Antikythera MechanismMar. 27, 2023
- 4 - 8Blackbeard's Lost TreasureMar. 20, 2023
- 4 - 7The "Missingest" Man in AmericaMar. 13, 2023
- 4 - 6The Ark of the CovenantMar. 06, 2023
- 4 - 5The Phoenix Lights PhenomenonFeb. 27, 2023
- 4 - 4The Lost Colony of RoanokeFeb. 20, 2023
- 4 - 3The Assassination of JFKFeb. 13, 2023
- 4 - 2Who is the Zodiac Killer?Feb. 06, 2023
- 4 - 1The Loch Ness MonsterJan. 23, 2023
