Pass generally consists of square or polygonal walls, gates, towers and urn. There are plenty of Los Angeles and moats. Among them, the city wall is the main project of the Great Wall, and the inner and outer eaves are mostly wrapped by giant bricks, filled with loess gravel, and the height is generally around 10 meter.
The top is 4 ~ 5 meters wide, and there are paths and ladders on the upper and lower walls. On the outer eaves of the city wall, there is a crib for observation and shooting, and on the inner eaves, there is a wall (or female wall) about 1 m high.
The focus of the Great Wall
Since Qin, Han, Ming and Qing Dynasties, many passes along the Great Wall have become places or centers for ethnic trade in the two major economic and cultural systems of agriculture and animal husbandry, and some have gradually developed into important towns along the Great Wall. The Great Wall not only ensures the normal development of agricultural economy, culture and animal husbandry economy and culture, but also provides a place and convenience for their exchange and complementarity.