Jinshanling Great Wall is the best preserved section of the Ming Great Wall, known by experts as the essence of the Ming Great Wall. It is dangerous in the mountains and plugged with water, and the city is undulating like a steel wall and iron wall. There are many carved buildings, such as guards, "one husband is Guan, the whole family is not open", known for its wide view, dense enemy buildings, and strange functions of building defense system.