The Temples of Siem Reap
This isn't an exhaustive list, it's just the handful I had time to see, and in my opinion, some of the best.
This is the one people come to see. It's on their flag, it's on their money.
Angkor Wat's neighbor. Lots of faces.
The Tomb Raider temple. Roots growing over ruins. Extremely popular with tourists.
Worth the trip.
Something to do with fertility. Two stories.
Dedicated to Siva.
Where royal families were cremated.