Roosevelt in the Amazon

After Theodore Roosevelt lost the American presidential election of 1912, he decided to explore an unknown tributary of the Amazon called the River of Doubt.

It was a trip that nearly killed both Roosevelt and his son, Kermit.

Witness brings together first-hand accounts of the trip, with the help of Candice Millard, author of River of Doubt - Roosevelt's Darkest Journey.

PHOTO: Roosevelt on the campaign trail in 1912 (Getty Images).