The principal monument include the monastery (wat) Mahathat, with its royal temple and its cemetery , sra si wat, with its two stupas, their graceful lines reflected in the water of the town's biggest reservoir ; and an impressive prang (reliquary tower typical of Ayutthaya art) from a somewhat later period. The site has been excavated and studied since the mid-20th century. In 1988 a 70 km. area was declared a historic park.