Tuol Sleng Museum of Genocide is located right in the former ground of S21, a secret prison of Pol Pot’s genocidal rule (1975-79). Nearly 2 millions of Cambodian people were starved and tortured to death during Pol Pot regime.
Before becoming a center of detention and torture under the Khmer Rouge regime in 1975, Toul Sleng was a college. The museum has photographs of nearly 5,000 victims as well as written materials and some paintings depicting life in the prison during the reign of terror. The S21 prison complex is left unchanged since the fall of Khmer Rouge.