Three locations used by Cambodia’s brutal Khmer Rouge regime as torture and execution sites 50 years ago have been added by Unesco to its world heritage list. The three sites listed on Friday include two notorious prisons and an execution site immortalised in the Hollywood film The Killing Fields. The Tuol Sleng Genocide Museum, located in the capital Phnom Penh, is the site of a former high school used by the Khmer Rouge as a notorious prison, better known as S-21. The M-13 prison, located in rural Kampong Chhnang province in central Cambodia, also was regarded as one of the main prisons of the early Khmer Rouge. But naming the three sites to the Unesco list will play a role in educating younger generations of Cambodians and others worldwide.