Wat Phu Khao Thong.
This enormous chedi was built after King Naresuan’s victory over the Burmese. The site only had this one large stupa, and only a small collection of very small temples, but for some reason was one of my favorite of the day. It also reminded me, slightly, of the Mayan temples of the Mexican Yucatan. Here too you can see the water levels from the recent flooding and can then only further imagine how much this structure has had to endure over the centuries…
More info on Ayutthaya.