Phra Nakhon Si Ayutthaya Historical Park, a vast stretch of historical site in the heart of Ayutthaya city, has been a UNESCO World Heritage Site since December 13, 1991.
There were three palaces in Ayutthaya: Grand Palace, Chantharakasem Palace (the Front Palace) and Wang Lang (the Rear Palace). In addition, there were many other palaces and buildings for royal visits located outside Ayutthaya, such as the palace at Bang Pa-In and Nakhon Luang Building at Nakhon Luang.