Sukhothai Kingdom started its history with clear evidence in the reign of Pho Khun Si Inthrathit (Phor Khun Bang Klang Hao, 1781 - 1822 B.E.). The power of the Sukhothai Kingdom during his reign was stable from spread out the territory around Thai culture has grown in every field, as shown in the first stone inscription, which prospered in terms of history, warfare, geography, law, tradition, government, economy, society, philosophy, Buddhism, Thai calligraphy. Pho Khun Si Inthrathit dynasty (Phra Ruang or Sukhothai) ruled the Sukhothai kingdom for 200 years, then united with Ayutthaya Kingdom. Sukhothai city plan is rectangular in shape, is about 2 kilometers long and 1.6 kilometers wide, with a city gate in the middle of the city wall on each side. Inside, there are still traces of the palace and 26 temples. The largest temple is Wat Mahathat. this historical park has been restored by the Fine Arts Department which has been aided by UNESCO Hundreds of thousands of visitors a year. Tourists can walk, ride a tram or ride a bicycle to explore easily and safely. On December 12, 1991, UNESCO Has declared this park a world heritage site together with Kamphaeng Phet Historical Park and Si Satchanalai Historical Park under the name “Historic Town of Sukhothai and Associated Historic Towns" due to the evidence that shows outstanding architectural works, it is representative of the early Thai arts and was the origin of the creation of Thailand. Tourists can visit in 3 ways: walking, cycling and taking the electric tram, by the park Bicycles are also available for rent. In addition, each registered historic site has an OR Code sign for smartphone users which you can scan to read more stories which available in 4 languages: Thai, Chinese, Japanese and French. Sukhothai was founded around the middle of the 18th Buddhist century. It is assumed that Sukhothai in the early days was influenced by Khmer art from Lawo or Lopburi which later elevated to the status of a royal with Pho Khun Bang Klang Hao or Pho Khun Sri Inthrathit be the first king was the beginning of the first kingdom of Thailand around 1792 B.E., the Sukhothai Kingdom prospered to its peak during the reign of King Ramkhamhaeng, the third king, recorded in a stone inscription, tells of a vast empire: North to Phrae, Nan, Luang Prabang; South to Nakhon Si Thammarat; East to Vientiane City; West to the city of Hongsawadee The system of government, father and son administration, promotes the rights and freedoms of the people. The highlight of Sukhothai City Planning is the irrigation system, is a system that distributes water for agriculture and consumption to the townspeople thoroughly. It can also help drain water overflow during the flood as well. During the rule of King Ramkhamhaeng, the people of Sukhothai lived peacefully with his full attention to the preservation of religion notice the appearance of the face of the buddha image created. Most of them had smiling mouths, reflect the uniqueness of the era and the number of temples that were built in abundance and Kamphaeng Phet Historical Park under the name "Sukhothai Historical City and its satellite city".