A Buddha statue is seen at Sa si of Sukhothai Historical Park, 460 kilometers north of Bangkok, Thailand, May 21, 2013. Sukhothai, capital of the Sukhothai Kingdom in the 13th-14th century, was inscripted in UNESCO's World Cultural Heritage list in 1991. [Photo/Xinhua]

A Buddha statue is seen at Tra Phang Ngoen of Sukhothai Historical Park, some 460 kilometers north of Bangkok, Thailand, May 21, 2013. Sukhothai, capital of the Sukhothai Kingdom in the 13th-14th century, was inscripted in UNESCO's World Cultural Heritage list in 1991. [Photo/Xinhua]