A visitor takes photos at Si Sawai 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 Mahathat 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]