In Cambodia, it was exploitation of humans by humans for ideological reasons - the most radical transformation of a society ever attempted. Wearing glasses was enough of a crime. A sign told the victims not to cry while being tortured with electric shocks and other methods. Barbed wire prevented them from committing suicide - jumping down the second or third floor would have been much preferable to watching your child being stabbed with a bayonet. Thousands and thousands of portrait pictures are on the walls, with fear of death in their faces.
Human creativity has no limits, also when it comes to cruelty.
The horrendous results of torture can be seen as well. Paranoia of the ruling elite. In the last room, skulls and bones make up a huge map of Cambodia. In the museum there are some camera teams, no tourists, some mine victims, and I, sitting down outside, watching a few kids play volleyball, writing in my diary, and crying. The same is true for another place on the Khmer Rouge tourist circuit.