Mass graves containing 8,895 bodies were discovered at Choeung Ek after the fall of the Khmer Rouge regime. Many of the dead were former political prisoners who were kept by the Khmer Rouge in their Tuol Sleng detention center.

The Killing Fields of Choeung Ek consist of mass graves, a buddhist stupa exhibiting the remains of thousands of Khmer Rouge victims, and a museum with historical artefacts.