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Season 5 Episode
- Season 4 The Loch Ness Monster
- Season 4 Who is the Zodiac Killer?
- Season 4 The Assassination of JFK
- Season 4 The Lost Colony of Roanoke
- Season 4 The Phoenix Lights Phenomenon
- Season 4 The Ark of the Covenant
- Season 4 The "Missingest" Man in America
- Season 4 Blackbeard's Lost Treasure
- Season 4 Decoding the Mysterious Antikythera Mechanism
- Season 4 The Puzzling Pyramids of Egypt
- Season 4 The Hunt for Stolen Nazi Treasure
- Season 4 The Deadly Bermuda Triangle
- Season 4 The Search for Noah's Ark
- Season 4 Who is D.B. Cooper?
- Season 4 The Legend of Bigfoot
- Season 4 Unlocking the Secrets of Stonehenge
- Season 4 The Search for El Dorado
- Season 4 The Mysterious Havana Syndrome
- Season 4 Unlocking the Secrets of the Nazca Lines
- Season 4 The Hunt for Cleopatra's Missing Tomb
- Season 4 TWA Flight 800
- Season 4 The Hunt for Hitler
- Season 4 The Lost Gold of WWII
- Season 4 The Black Dahlia
- Season 4 Gardner Museum Robbery
History's Greatest Mysteries - Season 4 Episode 19 Unlocking the Secrets of the Nazca Lines
7.40 48 minutes They've been called the world's greatest archaeological enigma. 2,000-year-old geoglyphs made in the Peruvian desert that span over 50 miles. The drawings are so massive, they can only be seen from the air. Can new research finally unravel their secrets? What is the true purpose of the incredible Nazca Lines?
