A rusted-out ammunition can sits on a bed frame inside a detention cell for high-ranking party cadres at the Tuol Sleng prison in Phnom Penh, Cambodia. As many as 2 million Cambodians -- or one-quarter of the population -- died under the Khmer Rouge from 1975 to 1979. An estimated 17,000 of them passed through Tuol Sleng, a former high school converted to a prison by the regime. All but a handful of them were murdered after an average two months of brutal interrogation. In these cells, the victims were tortured and sometimes killed while shackled to the bed frames. March 1, 2012.