One of the places we visited while in Cambodia was the Toulsleng Genocide Museum in Phnom Penh. Originally a high school, the Khmer Rouge regime turned it into a interrogation/execution center, known at Security Prison 21 (S-21), from 1975 to 1979. The museum showcased letters, interviews, and recreated torture rooms.
One of the men who survived the interrogation center was at the site, with copies of his book. I can't even imagine the things he experienced and witnessed.
Currently listening to: "Wake Up Neverender" Coheed and Cambria