The Great Wall, was a military fortification in ancient China. It is a tall, strong and continuous wall, which is used to limit the actions of the enemy. The Great Wall is not a simple isolated wall, but a defense system which takes the wall as the main body and combines 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 in ancient China. This is the origin of the famous allusion "the warlords of beacon fire drama" which took place in the capital city of Haojing (now Xi'an, Shaanxi Province). During the Spring and Autumn Dynasty and the Warring States period, countries fought for hegemony and defended each other. The construction of the Great Wall entered the first climax, but the length of the construction was relatively short at this time. After Qin destroyed the six countries and unified the world, Qin Shihuang connected and repaired the great wall of the Warring States period, which was called the great wall of thousands of kilo meter. The Ming Dynasty was the last dynasty to overhaul the Great Wall. Most of the Great Wall people see today were built at this time.
The Great Wall resources are mainly distributed in Hebei, Beijing, Tianjin, Shanxi, Shaanxi, Gansu, Inner Mongolia, Heilongjiang, Jilin, Liaoning, Shandong, Henan, Qinghai, Ningxia and Xinjiang. The length of Hebei Province is more than 2000 kilometers, and that of Shaanxi Province is 1838 kilometers. According to the national survey results 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 km, and that of the Qin and Han Dynasties and early periods is more than 10000 km, with a total length of more than 21000 km.
In December 1987, the Great Wall was listed as a world cultural heritage.
The Great Wall is the greatest military defense project in the ancient history of the world. It is not a simple and isolated line wall, but from point to line, from line to surface, connecting the passes, military fortresses, pass cities and military towns along the great wall into a tight network, forming a complete defense system. The system of military fortress, Guancheng and military important town has many functions, such as fighting, commanding, observing, communicating, concealing, and so on. It is also equipped with the point and line of garrison troops and the whole defense project.
Since ancient times, China has been a defensive country, and the great wall also shows this point.
