Located on the Lopburi side of the river, Wat Na Phra Meru survived Ayutthaya's destruction in 1767 because it was used as a base for the invading Burmese army. It's worth visiting to see the black-stone Buddha dating from the Mon (Dvaravati) period, as well as the central sanctuary, with the principal 1.8m-tall (6-ft) Buddha and stunning vaulted ceilings supported by ornate columns. A Burmese king died here when his cannon backfired while he was attempting an attack.