It's difficult to imagine that horrors such as those happened here and at killing fields are really only a bit over 30 years in the past. This place features torture cells which still have stains of blood on the walls. Photos of victims before and after the torture. Etc.
Although not required, you'll learn a lot more by hiring a guide ($3/person), although their English accent varies,
If you own or manage Tuol Sleng Genocide Museum, register now for free tools to enhance your listing, attract new reviews, and respond to reviewers.