Built in the 14th century for private royal use, this was the city’s largest temple. Now little remains apart from brick foundations and three well-preserved 15th-century chedis, enshrining the ashes of several Ayutthayan kings. This is one of the only temples in the park that you’re allowed to climb, which makes it the most photographed sight in the historical park. Nothing remains of the Grand Palace, just to the north, which is included in the same ticket, apart from the foundations of three buildings and a wall around the compound. If the temple looks familiar, it is because it was the model for Bangkok’s Wat Phra Keo at the Grand Palace.