Read an account of Cambodia's Khmer Rouge trials here.
On June 27, in what has been called the most significant war crimes tribunal since the Nazi trials at Nuremberg, four top leaders of the brutal Khmer Rouge regime went on trial for genocide at the U.N.-backed Extraordinary Chambers in the Courts of Cambodia (ECCC). The court was established in order to facilitate a resolution to one of the grimmest chapters of the 20th century -- the crimes against humanity perpetrated during the Khmer Rouge's 1975-1979 rule, during which an estimated 1.7 million Cambodians were murdered, starved, worked to death, or died of disease in the country's "Killing Fields."
Above, a Cambodian monk looks at photos of victims of the Khmer Rouge's secret prison, codenamed Security Prison 21 or S-21, on display at the Tuol Sleng Genocide Museum on July 25, 2010, in Phnom Penh. When the Vietnamese Army invaded in 1979, the S-21 prison staff fled, leaving behind thousands of written and photographic records. Altogether more than 6,000 photographs remain; the majority, however, have been lost or destroyed.
Paula Bronstein/Getty Images