
S-21 was a detention center/prison during the Khmer Rouge period (striking similar to concentration camps and Nazi Germany)
Links to the Genocide Museum we will be visiting/staying across the street from (Here's where we're staying at while in Phnom Penh: http://www.boddhitree.com/index.html). FYI: These sites contain graphic pictures.
http://en.wikipedia.org/wiki/Tuol_Sleng_Genocide_Museum
http://www.flickr.com/photos/mybigtrip/sets/671304/
http://www.pbase.com/kissfoto/s21
http://www.chgs.umn.edu/Visual___Artistic_Resources/Cambodian_Genocide/Prisoners_at_S-21_Prison/prisoners_at_s-21_prison.html