Killing caves of Phnom Sampeau
The killing caves of Phnom Sampeau are a Khmer Rouge (KR) execution site on Phnom Sampeau, a hill 7 miles (11 km) southwest of Battambang in western Cambodia. KR killed their victims on top of the cave at the rim of a daylight shaft or ceiling hole and threw the corpses into the cave.
Source: Wikipedia — Killing caves of Phnom Sampeau (CC BY-SA 4.0)