Great Wall, also known as the Great Wall, is a military defense project in ancient China. It is a tall, solid and continuous terrace to limit the actions of enemy horsemen. The Great Wall is not a simple isolated city wall, but a defense system which takes the city wall as the main body and combines with a large number of cities, barriers, pavilions and signs.
The history of the Great Wall can be traced back to the Western Zhou Dynasty, from which came the famous allusion "the princes of beacon fire opera" which took place in the capital of Chengjing (now Xi'an, Shaanxi Province). During the Spring and Autumn Period and the Warring States Period, countries fought for hegemony and defended each other. The construction of the Great Wall reached its first climax, but at this time the length of the construction was relatively short. After the Qin Dynasty destroyed the six countries and unified the world, Qin Shihuang joined and repaired the Great Wall of the Warring States, which was known as the Great Wall. The Ming Dynasty was the last dynasty to build the Great Wall. Today most of the Great Wall people see is built at this time.
Great Wall resources are mainly distributed in Hebei, Beijing, Tianjin, Shanxi, Shaanxi, Gansu, Inner Mongolia, Heilongjiang, Jilin, Liaoning, Shandong, Henan, Qinghai, Ningxia, Xinjiang and other 15 provinces and municipalities. Among them, Shaanxi Province is the province with the richest resources of the Great Wall in China, with the length of the Great Wall reaching 1838 kilometers. According to the national survey of the Great Wall resources by the Department of cultural relics and surveying and mapping, the total length of the Great Wall of the Ming Dynasty is 8851.8 kilometers, and that of the Qin, Han and early periods is more than 10,000 kilometers, with a total length of more than 21,000 kilometers.
On March 4, 1961, the Great Wall was announced by the State Council as the first batch of national key cultural relics protection units. In December 1987, the Great Wall was listed as a World Heritage Site.