We had already been to the S21 prison & I really wasn't looking forward to this as I thought it was just going to be another gruesome exhibition of bones & torture. Although covering the same topics I thankfully found it to be a very different experience. The Audio tour is excellent & there's almost a serenity to the place as you walk around listening to the audio - as difficult as some of it may be - and very unlike the feeling at the prison. Definitely view the video at the end of the tour as it gives you a better appreciation of the site as it was.
BEWARE: on our first attempt out to the killing fields we had our bag stolen from our Tuk Tuk as we travelled along the road. It appears this isn't an uncommon occurrence - there had been several reportings in a couple of days - so please hold onto your possessions tight!More