The Great Wall is an ancient defense project with the longest construction time and the largest engineering quantity in China and even in the world. Since the 7th and 8th centuries BC, it has been built continuously for more than 2,000 years, which is distributed on the vast land in northern and central China, with a total length of more than 50,000 kilometers. It is called "more than 2,000 years up and down, and more than 100,000 miles in vertical and horizontal directions".

Such a huge project is unique not only in China, but also in the world, so it was listed as one of the seven wonders of the Middle Ages with the Colosseum and the Leaning Tower of Pisa hundreds of years ago.

Architectural history:

The history of building the Great Wall can be traced back to the Western Zhou Dynasty in the 9th century BC, in order to defend against the attack of nomadic people in the north. Once built a continuous arrangement of castles "Fierce City" as a defense.

In the 7th and 8th centuries BC, during the Spring and Autumn Period and the Warring States Period, in order to compete for hegemony and defend each other, governors of various countries built the Great Wall on their own borders according to their own defense needs. In the 7th century BC, the Great Wall of Chu was first built, and then the vassal states of Qi, Han, Wei, Zhao, Yan, Qin and Zhongshan also built the Great Wall to protect themselves.

Extended data:

Cultural value:

1, The Great Wall, as a historical site, has put hydrology in China. The Great Wall of Wan Li contains the splendid culture and art of the Chinese nation for more than 2,000 years, and its connotation is very rich. In addition to the architectural layout, modeling, sculpture and painting of the city wall, Guancheng, Zhencheng and beacon tower, there are also poems and songs, folk literature and opera rap.

2. Throughout the ages, I don't know how many emperors, generals, foot soldiers and poets left an immortal chapter for the Great Wall. Frontier poems have become an important school in classical literature. For example, Li Bai's "The wind has traveled thousands of miles, knocking on the battlements of Yumenguan", Wang Changling's "The bright moon in Qin Dynasty is about the Han Dynasty, and the Long March people have not returned", and Wang Wei's "Advise you to have a glass of wine and go out of Yangguan for no reason".

References:

People's Network-World Cultural Heritage: The Great Wall