I went to this temple complex last year and it is really awesome.

It's so reminiscent of an Incan of Mayan temple. It's an ancient temple on a large hill and it's got a long plaza running out from the temple on the east and west sides and when you're standing at one end you can see all the way through to the other side where the sun rises and sets. I was lucky enough to be there just before sun set and see it. It is really a temple dedicated to sun worship or at least the builders had it in mind to pay their respects to the sun.

If you are not keen on braving Cambodia I would suggest this place as an alternative. It really makes you feel a sense of history- it just oozes ancient culture. Really cool.