Wat Phra Si Ratana Mahathat is an ancient temple, locally called Wat Na Phra That, is located on the west bank of the Mae Klong River in the town.Its elegant prangs or pagoda remains in good condition and was probably copied from Cambodia's Angkor Wat. The beautiful prang made of bricks and a stone stands on a rectangular base with pathways around the cloisters. The outer stucco designs were made in the reign of King Borommakot of Ayutthaya. Buddha images of Dvaravati, Lop Buri and Ayutthaya periods are placed around the pagoda. The temple is the most famous temple in Ratchaburi because it is the first temple and it has a fascinated architecture.
It is possible to walk up to the ninth level ,takes about two hours and stay all day for the experience in nature education.