constructed after King Norodom relocated the royal capital from Oudong to Phnom Penh in the mid-19th century.

a notorious Security Prison 21 (S-21) by the Khmer Rough regime from its rise to power in 1975 to its fall in 1979.

a number of sites in Cambodia where collectively more than a million people were killed and buried by the Communist Khmer Rouge regime, during its rule of the country from 1975 to 1979 and 15 Km from Phnom Penh.