The Tuol Sleng Genocide Museum (Khmer: សារមន្ទីរឧក្រិដ្ឋកម្មប្រល័យពូជសាសន៍ទួលស្លែង) is a museum in Phnom Penh, the capital of Cambodia, chronicling the Cambodian genocide. The site is a former high school which was used as the notorious Security Prison 21 (S-21) by the Khmer Rouge regime from its rise to power in 1975 to its fall in 1979. Tuol Sleng (Khmer: ទួលស្លែង Khmer pronunciation: [tuəl slaeŋ]) means "Hill of the Poisonous Trees" or "Strychnine Hill". Tuol Sleng was just one of at least 150 execution centers established by the Khmer Rouge. On the 26 July 2010, the Extraordinary Chambers in the Courts of Cambodia convicted the chief of Tuol Sleng Prison, Kaing kek Iew, (alias Duch) for crimes against humanity and grave breaches of the 1949 Geneva Conventions and sentenced him to life imprisonment.
The price 25$ both ways
by car (3-4people)