The entrance into one of the torture rooms at Tuol Sleng. I opted to take a private tour of the site with a guide from the museum. These are people who lived through the Khmer Rouge regime and although they were not imprisoned here at S-21, they give personal insight into life under Pol Pot. It was very interesting and I would definitely recommend visitors to take advantage of this option.
Here's the sign I mentioned yesterday, reminding people not to smile or laugh while visiting this somber place. The sign also reminds people not to graffiti the walls, it seems strange that such a sign would be necessary (who would think to desecrate such a site?), but I guess it is. More signs can be found here. Photos taken in December 2016.