Pre Rup was built by King Rajendravarman II year: 944 to 968 AD. It was a nice place to watch sunset because it is higer up from the ground, another good place is Phnom bakheng
, outside the south gate of Angkor Thom.
Entrance: US$ 40 (can be bought from Angkor Ticket Booth north of Siem Reap)
You can reach there by tuk tuk. The Temple was located north east of the Angkor Thom