Season 4

1. The Loch Ness Monster

2. Who is the Zodiac Killer?

3. The Assassination of JFK

4. The Lost Colony of Roanoke

5. The Phoenix Lights Phenomenon

6. The Ark of the Covenant

7. The "Missingest" Man in America

8. Blackbeard's Lost Treasure

9. Decoding the Mysterious Antikythera Mechanism

10. The Puzzling Pyramids of Egypt

11. The Hunt for Stolen Nazi Treasure

12. The Deadly Bermuda Triangle

13. The Search for Noah's Ark

14. Who is D.B. Cooper?

15. The Legend of Bigfoot

16. Unlocking the Secrets of Stonehenge

17. The Search for El Dorado

18. The Mysterious Havana Syndrome

19. Unlocking the Secrets of the Nazca Lines

20. The Hunt for Cleopatra's Missing Tomb

21. TWA Flight 800

22. The Hunt for Hitler

23. The Lost Gold of WWII

24. The Black Dahlia

25. Gardner Museum Robbery