Tuol Sleng Genocide Museum, Phnom Penh: History, highlights and visitor guide

History and context

The story behind Tuol Sleng Genocide Museum

Tuol Svay Prey High School became Security Prison 21 (S-21) under the Khmer Rouge, who used it from 1975 and held prisoners there from early 1976 until the regime fell in January 1979. The People's Republic of Kampuchea reopened the site as a museum in 1979 to 1980.

Wikipedia gives 18,145 prisoners in its infobox and about 20,000 in the text, and notes that the numbers are estimates.

Useful facts

Tuol Sleng Genocide Museum facts at a glance

Location

Street 113, Boeung Keng Kang III

Experience type

Memorial museum

Known for

Former S-21 prison, victim photographs, preserved cells

Former use

Tuol Svay Prey High School, then S-21

Time or schedule

Daytime hours; confirm locally

Why it matters

Why Tuol Sleng Genocide Museum is worth your time

Tuol Sleng explains one of the 20th century's major atrocities through the building where it happened. Roughly 18,000 to 20,000 people passed through S-21, and only about a dozen are known to have survived. The museum keeps the record of the prison and honours the victims by name through photographs.

For families, it provides context for modern Cambodia and the pace of its recovery. It is a difficult visit, but many visitors say it changes how they see the country. UNESCO inscribed the Cambodian Memorial Sites, including Tuol Sleng, as a World Heritage Site in 2025, according to Wikipedia.

Highlights

What not to miss

1. 01

   Preserved cell blocks

   Classrooms divided into small cells, left to speak for themselves.

2. 02

   Victim photographs

   Portraits that give names and faces to the numbers.

3. 03

   Survivor testimony

   A weekday afternoon session, where offered.

Plan your visit

How to experience it

Go in the morning, dress modestly and be ready for serious content. The museum sits in the former Tuol Svay Prey High School, and the buildings still show the classrooms divided into small cells. Many visitors choose an audio guide or a guide so that the history is explained as you walk.

The displays include photographs of prisoners, many taken on arrival, and written accounts. These are hard to look at, and children or anyone who is easily distressed should skip it. Move at your own pace and step outside to the courtyard when you need air.

Wikipedia notes that a survivor testimony is presented on weekday afternoons, which some visitors find a meaningful addition. Afterwards, plan a quiet lunch and a rest rather than another heavy sight on the same day.

Know before you go

Timing, access and comfort

Area

Street 113, Boeung Keng Kang III, south of the centre

Time needed

About 1.5 to 2 hours

Best time

Morning, when it is cooler and quieter

Walking level

Moderate

Senior comfort

The site is a set of school buildings with stairs and open courtyards. Some galleries are stuffy; take water and breaks. The emotional weight is the harder part for many older visitors.

Tickets and access

A source we opened gave the hours as 8 am to 5 pm, with a weekday survivor testimony in the afternoon, and a Wikivoyage listing gave entry of about US$5 plus a fee for an audio guide. Check locally. Dress modestly and expect strict conduct rules.

Plan it with

FAQs