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- S4.E1 ∙ The Loch Ness Monster
- S4.E2 ∙ Who is the Zodiac Killer?
- S4.E3 ∙ The Assassination of JFK
- S4.E4 ∙ The Lost Colony of Roanoke
- S4.E5 ∙ The Phoenix Lights Phenomenon
- S4.E6 ∙ The Ark of the Covenant
- S4.E7 ∙ The "Missingest" Man in America
- S4.E8 ∙ Blackbeard's Lost Treasure
- S4.E9 ∙ Decoding the Mysterious Antikythera Mechanism
- S4.E10 ∙ The Puzzling Pyramids of Egypt
- S4.E11 ∙ The Hunt for Stolen Nazi Treasure
- S4.E12 ∙ The Deadly Bermuda Triangle
- S4.E13 ∙ The Search for Noah's Ark
- S4.E14 ∙ Who is D.B. Cooper?
- S4.E15 ∙ The Legend of Bigfoot
- S4.E16 ∙ Unlocking the Secrets of Stonehenge
- S4.E17 ∙ The Search for El Dorado
- S4.E18 ∙ The Mysterious Havana Syndrome
- S4.E19 ∙ Unlocking the Secrets of the Nazca Lines
- S4.E20 ∙ The Hunt for Cleopatra's Missing Tomb
- S4.E21 ∙ TWA Flight 800
- S4.E22 ∙ The Hunt for Hitler
- S4.E23 ∙ The Lost Gold of WWII
- S4.E24 ∙ The Black Dahlia
- S4.E25 ∙ Gardner Museum Robbery
