The ancient city of Ayutthaya, or Phra Nakhon Si Ayutthaya has been the capital of Thailand for 417 years until it was destroyed by the Burmese army in 1767 during the Burmese-Siamese War. The ruins of the old city is now known as the Ayutthaya Historical Park. Some parts of the park was declared a UNESCO World Heritage Site in 1991 which includes Wat Ratchaburana, Wat Mahathat, Wat Phra Sri Sanphet, Wat Phra Ram and Wiharn Phra Mongkhon Bopit.