More than 5,000 human skulls are piled in a monument at the Killing Fields of Choeung Ek roughly 17 km from Phnom Penh, Kingdom of Cambodia. During the reign of the brutal Khmer Rouge, at least 200,000 innocent Cambodians were executed without trial and dumped in mass graves like the ones at Choeung Ek. Choeung Ek claimed 17,000 people between 1975 and 1979. Mass burial pits are scattered throughout the grounds from which almost 9,000 bodies have been exhumed. Many pits have not yet been excavated.