SUKHOTHAI
Found in the 13th century, Sukhothai (literally means Dawn of Happiness) was the first truly independent Thai Kingdom, which enjoyed a golden age under King Ramkhamhaeng, credited with creating the Thai alphabet. The superb temples and monuments of this great city have been lovingly restored in Sukhothai Historical Park, a UNESCO World Heritage Site and a must-see for all travellers.
(Source: TAT Website, for more information please follow this link:
http://www.tourismthailand.org/destinationguide/list.aspx?provinceid=51)