Season 6

1. Mystery of The Disembodied Feet

2009-10-27

2. Inside LSD

2009-11-03

3. Secret History of Diamonds

2009-11-10

4. 24 Hours After Asteroid Impact

2009-11-17

5. Nazi Mystery: Twins from Brazil

2009-11-24

8. 25 Years

2010-04-19

9. Journey to an Alien Moon

2010-04-20

10. Fatal Insomnia

2010-04-27

An extremely rare genetic disease passed down through generations, fatal familial insomnia's (FFI) primary symptom is sleeplessness, but with a fatal twist: victims are dead within months. National Geographic delves into the science of sleep to find out why we need sleep and what happens to us when we don't get it. Witness the pioneering research inside the sleeping brain as well as the mind forbidden to rest for days at a time.

11. Talibanistan

2010-06-08

12. Electronic Armageddon

2010-06-15

13. Inside the DEA

2010-08-10

14. 24 Hours After Hiroshima

2010-08-17

15. Albino Murders

2010-08-24

16. Inside Bioterror

2010-08-31

17. Can the Gulf Survive?

2010-09-28

18. Lost Mummies of New Guinea

2010-11-16

19. How Man Tamed the Wild

2010-11-23

20. Born to Rage?

2010-12-14

21. American Hostage

2011-01-17

22. Lost Cannibals of Europe

2011-01-24

23. How to Build a Beating Heart

2011-02-07

24. Clash of the Americas

2011-02-14

25. Finding the Lost da Vinci

2012-03-18

Leonardo da Vinci's "The Battle of Anghiari" vanished 500 years ago, with only copies rendered by other artists left behind to confirm its existence. Scientist and art enthusiast Maurizio Seracini, has dedicated 36 years to tracking down the missing mural, and seems to be on the verge of uncovering the hidden fresco behind the walls of the Palazzo Vecchio in Florence, Italy.

26. The Man Who Can Fly

2012-02-12

27. Fighting ISIS

2016-03-05

National Geographic writer Neil Shea travels to the heart of Kurdistan on a quest to meet the Kurdish fighters on the front lines against the world's biggest terrorist threat, ISIS.