Tuol Sleng Genocide Museum (S-21)
A former high school converted into Security Prison 21, where the Khmer Rouge tortured and documented more than 12,000 prisoners.
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Share a photoHistory & haunting lore
Only a handful of prisoners survived S-21, leaving classrooms divided into brick cells and walls of mugshot photographs that stare at visitors today. The regime meticulously recorded confessions before sending victims to the Choeung Ek killing fields.
The museum keeps bloodstains and iron bedframes in place as evidence. Cambodian guides, some of whom lost family to the regime, lead tours with devastating calm, and visitors often find the courtyard unnaturally quiet after leaving.
Current site status
Open daily with modest dress required; audio guides are available and visitors should allow at least two hours.