Today we visited S-21, the school that was converted into a prison camp in 1975 to inter enemies of Pol Pot's regime. The standard stay was 2-4 months of torture. After the confessions had been extracted they were sent to the Killing Fields 13km away. Pol Pot was overthrown in 1979, having killed 20,000 people at this prison and almost 2 million of his own in total. This museum opened in 1980.