The city walls form a rectangle about 2 km east-west by 1.6 km north-south. There are 193 ruins on 70 square kilometers of land. There is a gate in the centre of each wall. Inside are the remains of the royal palace and twenty-six temples, the largest being Wat Mahathat. The park is maintained by the Fine Arts Department of Thailand with help from UNESCO, which has declared it a World Heritage Site.