Some of the 8,000 human skulls at the Choeung Ek Genocidal Center sit in a glass case.
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Tuol Sleng Genocide Museum —
"While getting lashes or electrification you must not cry at all." A display at the Tuol Sleng Genocide Museum shows the 10 rules prisoners were forced to follow at S-21 prison.
Karla Cripps/CNN
Rouge rule —
A woman cries next to a dead body on April 17, 1975 in Phnom Penh, after the Khmer Rouge entered the Cambodian capital to establish the government of Democratic Kampuchea.
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High school to prison —
Phnom Penh's Tuol Sleng Genocide Museum is set in what was once a high school and later (1975-1979) used by the Khmer Rouge as a prison and interrogation center.
Karla Cripps/CNN
Deadly tales —
When local authorities renovated the Killing Fields in 2011, they turned this series of mass graves, where the Khmer Rouge executed and buried the inmates of Tuol Sleng, into a tourism spectacle, complete with audio tours, benches, refreshment stalls and souvenir stands.
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Empty inside —
As well as housing the Genocide Museum, Tuol Sleng still features empty rooms and corridors where once school lessons were provided, and later war crimes were committed.
