1 has a long history.

Qin Changcheng was built in the 3rd century BC and has a long history of more than 2,300 years. If traced back to the Chu-Qi Great Wall in the late Western Zhou Dynasty and the Spring and Autumn Period and the Warring States Period, the Great Wall in China has a history of at least 2,700 years. Even the Great Wall built in the Ming Dynasty is more than 600 years old. It is very rare, precious and rare that such an ancient and great building can be preserved so far in the world.

2, the length is amazing

From the Spring and Autumn Period and the Warring States Period to the Ming Dynasty, the Great Wall was maintained and added to varying degrees in all previous dynasties. The Great Wall spans 65,438+06 provinces, municipalities and autonomous regions in the Yellow River and the Yangtze River valley, with a total length of 65,438+008,000 Li (54,000 km) in the east-west and north-south directions. Among them, Qin Changcheng, Han Great Wall and Ming Great Wall are all more than one Wan Li. Because it is more than Wan Li, it is called the Great Wall of Wan Li.

This project is huge.

According to scientists' rough calculation, if a wall with a width of 1 m and a height of 5 meters is built from the soil, bricks and stones of the Great Wall in the Ming Dynasty, it can circle the earth. If it is used to pave a road with a thickness of 0.3 meters and a width of 5 meters, it can circle the earth three times. According to the report of American astronauts on the moon, without astronomical telescope, they can only see two man-made buildings on the earth: one is the seawall, the reclamation project in Suedeze, the Netherlands, but it is short and small, which is hard to argue. First, the Great Wall of Wan Li, China, which spans the northern half of the earth and looks like a ribbon, is very spectacular, which shows the greatness of this project.

This building is great.

Where the Great Wall of Wan Li passes, or mountains and valleys, or rivers and lakes, or desert grasslands. With extremely complicated and steep geological terrain, the construction work is particularly difficult. To build the Great Wall, we must understand and apply scientific and technical knowledge such as mathematics, mechanics, geometry, surveying, geology, architecture, histology, transportation and so on. The working people in ancient China were able to build this huge and complicated project and stand for thousands of years, which shows that the infinite wisdom and great creative spirit of the Chinese nation are convincing and eulogizing.