Wat Phra Mahathat, Thailand, was a royal Temple of the Ayutthaya Kingdom. It is one of the oldest and most significant temples in the history of Ayutthaya as it housed the Buddha's holy relic. Many important royal ceremonies of the Ayutthaya era had been hosted here. When the Ayutthaya Kingdom failed in 1767, Wat Phra Mahathat was severely damaged by fire and was since abandoned. The temple is located in the area of the Ayutthaya Historical Park nowadays. attractions in Wat Phra Mahathat of Phra Nakhon Si Ayutthaya include remains of important old buildings such as pagodas, octagonal pagodas, royal hall, small temples, murals under a Bodhi tree, and the famous sand-stone Ayutthaya-style head of the Buddha image in a tree's root. Nearby attractions - The Ancient Palace, with only the basement of the building left to be seen today. - Wat Phra Sri Sanphet, an important temple in the royal palace of the Ayutthaya era.

Located on the bank of the Maenam Chao Phraya, to the west of the city Island is Wat Chaiwatthanaram. Built in 1630 by King Prasat Thong to honor his mother, Wat Chai Wattanaram was conceived as a replica of the Angkor Temple. One of the most visited historical site of Ayutthaya, Wat Chaiwattanaram rests on the bank of the Chao Phraya river, to the west of the city Island.

Wat Yai Chai Mongkhon is a beautiful temple off the historical island. Hihglights are its 60 meter tall bell shaped chedi and a large Reclining Buddha.