Visit and know more about the dark history of the genocide under Pol Pot's regime. Visit when you're in a happy or light mood since you'll be depressed afterwards.
Maybe the most interesting attraction in the city, it is a must. A good 1,5hrs needed to see and listen everything. Very striking. Entrance 6USD with audio, take audio to have a better understanding.
We had Mr. Lungdi as our tour guide and he was extremely knowledgeable. We highly recommend getting yourself a tour guide. A must if you want to learn about Cambodia's not so long ago history.
This shows you the length people go to under torture. Innocent people confessing and even implicating their family members to get the torture to end. Out of 20,000 prisoners here, only 7 survived.
It's really not something you want to see, but you need to see it to make sure it never happens again. 30% of the population killed by the need to incriminate others under torture.