Ayutthaya is the Historical site Founded in c. 1350, Ayutthaya became the second Siamese capital after Sukhothai. It was destroyed by the Burmese in the 18th century. Its remains, characterized by the prang (reliquary towers) and gigantic monasteries, give an idea of its past splendour. Ayutthaya is 76 kilometres north of Bangkok and boasts numerous magnificent ruins. The ruins indicate that Ayutthaya was one of Southeast Asia's (and probably the world's) most prosperous cities in the 17th Century and beyond. 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. What you can see: Wat Mahathat, Wat Prasrisanphet(old palace), Wat Yai Chaimongkol, Wat Chaiwattanram, Bang Pa Inn Sumer Palace, Elephant camp.