6x1 - Mystery of The Disembodied Feet

October 27, 2009

6x2 - Inside LSD

November 3, 2009

6x3 - Secret History of Diamonds

November 10, 2009

6x4 - 24 Hours After Asteroid Impact

November 17, 2009

6x5 - Nazi Mystery: Twins from Brazil

November 24, 2009

6x8 - 25 Years

April 19, 2010

6x9 - Journey to an Alien Moon

April 20, 2010

6x10 - Fatal Insomnia

April 27, 2010

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.

6x11 - Talibanistan

June 8, 2010

6x12 - Electronic Armageddon

June 15, 2010

6x13 - Inside the DEA

August 10, 2010

6x14 - 24 Hours After Hiroshima

August 17, 2010

6x15 - Albino Murders

August 24, 2010

6x16 - Inside Bioterror

August 31, 2010

6x18 - Lost Mummies of New Guinea

November 16, 2010

6x19 - How Man Tamed the Wild

November 23, 2010

6x20 - Born to Rage?

December 14, 2010

6x21 - American Hostage

January 17, 2011

6x22 - Lost Cannibals of Europe

January 24, 2011

6x23 - How to Build a Beating Heart

February 7, 2011

6x24 - Clash of the Americas

February 14, 2011

6x25 - Finding the Lost da Vinci

March 18, 2012

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.

6x26 - The Man Who Can Fly

February 12, 2012

6x27 - Fighting ISIS

March 5, 2016

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.