Choeung Ek Killing Fields Memorial
Between 17 April 1975 and early January 1979, the Khmer Rouge, the Democratic Kampuchea regime led by Pol Pot, ruled Cambodia until Vietnamese forces took Phnom Penh and ended it. In that time, an estimated 1.7 to 2.2 million people died, roughly a quarter of the population, from execution, starvation under forced agrarian policy, forced labor, and disease. Two sites in and near Phnom Penh preserve the direct evidence of that period, and most visitors to the city choose to see them.
Tuol Sleng Genocide Museum (S-21)
A former high school in central Phnom Penh, converted by the Khmer Rouge into their central secret prison and interrogation center. An estimated 14,000 to 20,000 people were held here between 1975 and 1979; almost all were killed, and only around 12 are known to have survived. The site has been preserved largely as it was found in 1980, cells, shackles, and thousands of the regime’s own prisoner photographs among them. It is a heavy, graphic place, and it does not attempt to soften that.
Admission is about $5 for adults, $3 for youth, with a $5 audio guide available in eleven languages that is worth the cost for understanding what you’re seeing. The museum is open daily, 8am to 5pm. Tickets are sold on-site; buy direct through the official Tuol Sleng site rather than a third-party reseller.
Choeung Ek
About 15km south of central Phnom Penh, a 30-45 minute tuk-tuk ride, Choeung Ek is the best known of the country’s killing fields, the execution and burial site for prisoners transferred from S-21. A memorial stupa at the center of the site holds more than 5,000 recovered skulls. Of 129 identified mass graves, many remain deliberately unexcavated out of respect for the dead. Bone fragments and cloth still surface seasonally after rain; staff collect them as part of routine site maintenance.
Admission, including the audio guide, is about $6. The site is open daily, 7:30am to 5:30pm. Most visitors go in the morning, when temperatures are lower.
Visiting
Most people visit Tuol Sleng and Choeung Ek together, in that order, the same sequence prisoners were moved through: detention, then execution. Treat it as one sober half-day rather than something to fit between other sightseeing. Modest dress, shoulders and knees covered, is expected at both sites, and photography is restricted in the most sensitive areas; follow the posted signs. Bring water; both sites are largely outdoors.
Neither site is set up around commercial tourism, and neither should be approached that way. There is no gift shop energy here, no need to seek out a particular vantage point for a photo. Go to understand what happened, read the accounts on display, and give the sites the time they ask for.
After the visit
Many visitors find it helps to shift tone deliberately afterward, a walk along the river, a quiet meal, before returning to the rest of the city. The Phnom Penh travel guide covers the Royal Palace and National Museum, along with the practical details, visas, money, and getting around, for the rest of a Phnom Penh visit, and the 3-day itinerary shows how one route sequences this half-day alongside the city’s other sights. For a broader overview of what Phnom Penh offers beyond these two sites, see what to see in Phnom Penh .