The famous Great Wall of Wan Li, like a vigorous dragon, twists and turns and crouches on the land of China. The Great Wall of Wan Li, magnificent, is a miracle created by the working people in ancient China, and the most magnificent construction project in the world, which is unique in human history. The Great Wall of Wan Li starts from Shanhaiguan in Hebei Province in the east and ends at Jiayuguan in Gansu Province in the west. It spans seven provinces, municipalities and autonomous regions, including Hebei, Beijing, Shanxi, Inner Mongolia, Ningxia, Shaanxi and Gansu, with a winding distance of 6,700 kilometers and an area of about10.3 million Li, and is called the "Great Wall of Wan Li". When people mention the Great Wall, they often associate it with Qin Shihuang. In fact, during the Warring States period before the Qin Dynasty, many vassal states such as Yan, Zhao, Wei, Qin and Han were building the Great Wall to defend each other. Later, after Qin Shihuang unified the "six countries", it took more than ten years to connect the Great Wall built by various vassal countries and expand it on a large scale, making it the majestic Great Wall of Wan Li, which can also be said to be a major military defense measure after Qin Shihuang's reunification. But in many dynasties after the Qin Dynasty, the Great Wall continued to be built until the Ming Dynasty. It can be said that the great project of Wan Li Great Wall was finally completed at the end of Ming Dynasty, forming the scale and appearance of the Great Wall today. The most prominent feature of the Great Wall is that it passes through mountains, deserts, grasslands and cliffs and is built with the ups and downs of the mountains. Because of the steep terrain, it stands like a flying oriental dragon. Between the Great Wall of Wan Li, countless watchtowers, beacon towers, passes and Fangcheng have been built at regular intervals. There are also many two-story forts built on the city wall. The top of the upper floor is a platform, surrounded by cribs and observation holes, which is convenient for observation and attack. There is a small brick house on the lower floor where soldiers can live and store food and weapons. There are many beacon towers on the commanding heights between the mountains inside and outside the Great Wall. This is used to transmit military information. Whenever the enemy attacks, the beacon tower is lit by smoke during the day and by fire at night, so that the news can spread to the capital quickly even if it is thousands of miles away. Another feature of the Great Wall is to build a Guancheng every 10 km. The size of Guanchengkou depends on the degree of terrain danger and military importance. Among them, the famous Guancheng include Shanhaiguan, Juyongguan, Badaling, Yanmenguan and Jiayuguan. For example, Juyongguan is built 50 kilometers northwest of Beijing. It is built in a deep mountain canyon about 20 kilometers long. The terrain is dangerous, and there is a tendency that "one person guards it and ten thousand people can't". It is the northwest gateway of ancient Beijing, and its geographical position is very important. In the center of Juyongguan, there is also a white marble platform called Yuntai. Originally, there were three stone pagodas built on Yuntai, which were built in the Yuan Dynasty and have now been destroyed. There is a hexagonal doorway under the platform. On the stone walls on both sides of the gate, there are four heavenly kings and many beautifully shaped Buddha statues carved. The four heavenly kings look bright-eyed and full of strength. There are a large number of stone statues at the door, as well as Buddhist scriptures carved in Chinese, Xixia and Tibetan. These statues and stone carvings were also carved in the Yuan Dynasty, which have high artistic value. Badaling is a part of Juyongguan, with an altitude of 1000 meters and steep terrain. Because the Badaling Great Wall section is particularly steep and majestic, and it is close to Beijing, it was renovated after liberation, and it has been listed as a national key cultural relics protection unit, and now it has become a popular tourist attraction for people at home and abroad. When you climb the highest beacon tower of Badaling Great Wall, from a distance, the winding Great Wall looks like a dragon, climbing the mountain and swimming to the distant horizon; Look at the fortresses of the Great Wall, one after another, one after another, endless and vast. Seeing such a magnificent scene, a sense of national pride arises spontaneously; The tall and long Great Wall is built on high mountains and cliffs, and the construction difficulty is unimaginable. At this time, you may think: it will be very hard for us to climb the Great Wall empty-handed, so how did we build such a magnificent Great Wall without any construction machinery in ancient times? No wonder people praise the Great Wall as a miracle of human activities, a monument in the history of human civilization and a symbol of the wisdom, strength and indomitable spirit of the Chinese nation. Therefore, the Great Wall is listed as a "World Cultural and Natural Heritage" protection project by the United Nations.