Phra Ruang castle hill Located in the east next to Wat Mahathat. King Rama VI assumed that This area used to be the base of the royal palace of the Sukhothai kings. Then the Fine Arts Department came in to excavate and renovate it in 1983. Found the base of the building in the form of an inverted lotus base and an inverted lotus base. It looks like a rectangular base with dimensions 27.50 x 51.50 meters. There are stairs at the front and back.