Siem Reap
It can get a bit tiring and frustrating, especially that at most temples you will be faced with hundreds of tourist from all parts of the world rushing through and taking photos with their cell phones and whatnots. I find that if you are prepared to take your time and slow down just to savour the sights, you will find windows of opportunity when the serenity of the place will return after the hordes of tourist have rushed through.
Still, there are certain temples that is on the itinerary of almost all tourists to Siem Reap and like most tourist (especially since this is our first visit to Siem Reap) we felt compelled to include them in our must visit list.