Wat Phra Si Sanphet (Thai: วัดพระศรีสรรเพชญ์; "Temple of the Holy, Splendid Omniscient") was the holiest temple on the site of the old Royal Palace in Thailand's ancient capital of Ayutthaya until the city was completely destroyed by the Burmese in 1767. It was the grandest and most beautiful temple in the capital and it served as a model for Wat Phra Kaew in Bangkok.

Wat Mahathat, “the temple of the Great Relic” was one of the most important temples in the Ayutthaya Kingdom. Located on the historical island the large monastery features a huge central prang, a very large principal viharn and ubosot and a great number of subsidiary chedis and viharns. The upper part of its once massive central prang has collapsed. Today only the base remains. One of the temple’s most photographed objects is the head of a stone Buddha image entwined in the roots of a tree.

Wat Lokaya Sutha is a massive temple ruin. It is aligned toward an east/west axis. The monastery has been heavily restored, including floor tiles and brick floors throughout. Most of the temple exists only at the basic foundation level. This includes some stubs of pillars and basic walls. At the eastern entrance are the remnants of three vihans. Behind these sermon halls is a large 30 meters high, Late Ayutthaya period, Khmer-style prang. This prang-tower has a hollow entrance on its eastern side. The remains of an ubsot can be seen behind the prang. Only the basic foundation layer has survived, but there are many sema stones and the detritus of Buddha images. A large bell tower stands on the southwestern corner of this ubosot. The highlight of this temple is its enormous reclining Buddha image (37 meters long and 8 meter high), which is located behind the ubosot.

Ayuthaya is famous for its sweet Muslim snacks, curries and nám prík (spicy dip), and the bustling undercover Chao Phrom Market is the place to find them, plus assorted Thai-Chinese and other Muslim dishes. Operating hours of this daytime market depend on individual vendors but it's at its peak during the early afternoon.