In the center of Angkor Thom, capital of King Jayavaraman VII is the Bayon temple. It was the official state temple of the king and was built in the 12th or 13th century. The building's trademark are the hundreds of faces found on several towers. Nobody knows exactly how many there were originally. It is estimated that there were about 50 towers, added at various points in time, and today only 37 survive.
Angkor Thom was the last capital of the Khmer empire before it's fall. It is the largest in area in today's Angkor park.