Toul Sleng was the tortured center where the Khmer rouge tortured people before they were brought to the killing field and killed them.

Royal Palace where the city set up by the old king in 1431-34.

Killing Field locates on the south of Phnom Penh City.where the Khmer Rouge 20,000people after tortured by them at Toul Sleng (S-21) . and killing field one of the largest killing sites in Cambodia from 1975-79 . most educated people and government servants in Lon Nol regime who supported by the US government from 1970-75. during the VN war. when Khmer Rouge took over Cambodia in 1975-79 . They started destroyed and killed people from Lon Nol regime. I went through the Khmer Rouge regime, and they killed my dad, elder brother, and my youngest sister died in 1977. it's best place to discover genocidal regime happened in Cambodia 1975-79 2 millions people killed included new -born babies. I learned a lot about this regime.