The Great Wall, also known as the Great Wall, is an ancient Chinese military defense project, is a tall, strong and continuous placanticline to limit the movement of the enemy riders. The Great Wall is not a single isolated wall, but a defense system with the city wall as the main body, combined with a large number of cities, barriers, pavilions and signs.
The history of the construction of the Great Wall can be traced back to the Western Zhou Dynasty, where the famous allusion "the princes of beacon fire opera" occurred in the capital of Haojing (now Xi'an, Shaanxi Province). During the Spring and Autumn Period and the Warring States Period, the nations fought for hegemony and defended each other. The construction of the Great Wall reached its first climax, but the length of the building was relatively short. After the unification of the six kingdoms, the first emperor of Qin connected and repaired the the Great Wall of the Warring States period. The Ming Dynasty was the last dynasty to overhaul the Great Wall. The the Great Wall that people see today is mostly 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 cities. Shaanxi is the most abundant province in China's the Great Wall. The the Great Wall is 1838 kilometers long. According to the national survey of the Great Wall resources conducted by the Department of cultural relics and surveying and mapping, the total length of the Great Wall of the Ming Dynasty was 8 851.8 km, the Qin and Han Dynasties and the early Great Wall exceeded 10,000 km and the total length exceeded 21,000 km.
In March 4, 1961, the Great Wall was declared the first batch of national key cultural relics protection units by the State Council. In December 1987, the Great Wall was listed as a world cultural heritage.