Like all the temples and palaces of Ayutthaya, the temple was sacked by the Burmese when they finally took Ayutthaya in 1767. Some of the smaller chedis in the outer courtyard were toppled, but the big chedi was just too big and is relatively undamaged. The ubosot (ordination hall) was set on fire so that today only the crooked walls remain.
A new ubosot has been built just inside the walls of the old one, although its not actually complete, as you can tell by looking at the bare concrete of the roof gables.
The big chedi sits in an inner courtyard now lined with modern Buddha images. You can climb up to the base of the bell shape for an excellent view across the flat landscape of Ayutthaya. On a good clear day you can see the prangs of Wat Phra Ram and Wat Ratburana.