Tuol Sleng Torture Center.

Yes — but it will sit with you for days. This is not an easy stop. A 1960s high school in southern Phnom Penh became Security Office 21, where the Khmer Rouge tortured and documented roughly 18,000 people between 1975 and 1979. Fewer than a dozen adults walked out alive. You go because the place forces you to look at what humans do to each other, and because survivors like Chum Mey still show up to tell you what happened.

Budget 2 to 3 hours, especially with the audio guide. A rushed hour covers the courtyard and Building A's interrogation rooms, but you'd miss the mugshot galleries and Vann Nath's paintings in Building B. The audio guide has roughly 30 stops with survivor testimony — plan to pause, sit on a bench under the frangipani trees, and breathe.

Grab or PassApp tuk-tuk from the riverside costs about $2 to $3.50 and takes 10 to 20 minutes. The museum sits at the corner of Street 113 and Street 350 in Boeung Keng Kang 3. City Bus Line 01 stops about a 10-minute walk east on Monivong Boulevard if you want to spend 1,500 riel instead. Avoid the tuk-tuk drivers waiting at the exit who quote $25 to $40 for a Killing Fields run — use the app.

No — Tuol Sleng was the interrogation prison; Choeung Ek is where guards executed most prisoners. S-21 held people for weeks or months while interrogators extracted confessions under torture. Once prisoners signed, guards trucked them 15 kilometers south to Choeung Ek at night for execution. The two sites pair naturally in one day, but they are different places with different horrors.

Only 7 to 12 adults survived out of roughly 18,000 prisoners. The Khmer Rouge spared people with useful skills — Vann Nath painted portraits of Pol Pot, Bou Meng painted Pol Pot and Mao, Chum Mey repaired typewriters and sewing machines. Bou Meng died in 2024 at age 85. Chum Mey still visits the museum and signs copies of his memoir.

Get the audio guide, then spend time with Vann Nath's paintings and the mugshot galleries in Building B. The audio guide includes survivor testimony that transforms the empty rooms. Vann Nath's oil paintings show exactly what he witnessed — waterboarding, hanging from the pull-up bar, electrocution. The mugshot walls hold thousands of faces, including children and infants, each with a serial number pinned to their clothing. Building A's ground floor still has the iron bed frames where soldiers found the last 14 victims chained on January 7, 1979.

Go at 8 a.m. when the museum opens, before the heat and the tour groups arrive. The dry season from November to April pushes temperatures past 35°C, and the brick isolation cells hold that heat like ovens. Morning light through the balcony wire mesh is also the most bearable way to see the courtyard. If you visit during the May-to-October monsoon, the rain on the corrugated roofing echoes through the corridors — heavier, but somehow fitting.

Only if you're Cambodian — foreigners pay $5, or $10 with the audio guide. Cambodian nationals, people with disabilities, and children under 10 enter free. Students aged 10 to 18 pay $3. The $5 entry fee is modest for what the museum preserves, and the extra $5 for the audio guide is the best money you'll spend in Phnom Penh.