Sukhothai Historical Park is a World Heritage Site. Important ancient monuments are contained within the old city walls and outside the city walls.
A characteristic feature of Sukhothai temple architecture is the lotus-bud chedi. It features a conical spire finial on a square-sided structure on top of a three-tiered base. However at Sukhothai also Sri Lankan and Srivijaya type monuments are present. Most of the temple structures in Sukhothai Historical Park were of course constructed during the Kingdom of Sukhothai era (from around 1235-1438 A.D.)
Inside the old city walls, Wat Mahathat occupies the largest section. It is a monastery about 200 meters square in size. Many original Buddha images are still present among the ruins. The compound contains no less than 198 chedis. The temple structures are described on the famous Sukhothai Stone Inscriptions.
Wat Si Sawai is located about 350 meters south of Wat Mahathat. Its three prangs were built in Lopburi style. Lintels, fragments of Hindu images and a linga indicate that the temple was initially a Hindu sanctuary. It was later transformed into a Buddhist temple.