After shopping at Russian Market I Sleng Genocide Museum in the afternoon and that afternoon I would never ever forget.
The moment you enter you will not feel like a museum, that's because it was formerly a high school, but later was converted into a prison and interrogation by the Khmer Rouge communist regime.
Make sure to take an audio tour to understand the history of the place.
This is the place where an estimated 20,000 people were imprisoned and tortured. It also serves as a memorial to those who died. Prior to this visit, I had very little knowledge about this dark side of the history of Cambodia. I have heard a little bit about the Khmer regime, but they did not make much of an impact on me NOT until I visited this place.
Walking inside the Genocide Museum, I saw many paintings on the wall showing victims being tortured. Most of them were awful depictions of the horror and suffering that the victims had to endure. Prisoners were routinely beaten and tortured with electric shocks, hot metal instruments and also hanging. Some of other methods they used were sleep deprivation, starvation, suffocation with plastic bags and heads under water.
The cruelty was beyond my understanding! How could any human being do this to another fellow human being? I was so shocked and depressed looking at that. Besides, most of the prisoners were ordinary Cambodians, not criminals and they were tortured simply to extract confessions to crimes they did not commit!
The paintings alone had already left a deep impact on me. But as we toured the building, checking out the torture cells, looking at thousands of photos of the victims and reading their stories, I suddenly felt down, very down.
Being the first time visitor, you might find place and history very much depressing and traumatic.