I was just stunned when visiting S-21 and couldn’t continue to The Killing Fields. What they did… just… indescribable, horrible.

From 1976 to 1979, an estimated 20,000 people were imprisoned at Tuol Sleng and it was one of between 150 and 196 torture and execution centers established by the Khmer Rouge and the secret police known as the Santebal (literally “keeper of peace”).