Ayutthaya, Thailand's Ancient Capital
Photos from Ayutthaya

Ayutthaya lies about a two hour's drive north of Bangkok.  It was Thailand's capital for approximately four hundred years, founded in 1351.  It was burned by Burmese invaders in 1767, which resulted in its abandonment and the establishment of Bangkok which remains Thailand's current capital.  

Below is one of the oldest Stupas, built in the 14th century, in the same era as the construction of Cambodia's Angkor Wat, the world's largest UNESCO world heritage site.  Stupas are Buddhist cylindrical structures containing the ashes, bones, or remains of religious figures, and are intended to function as pilgrimage sites for worship and meditation.