Ninghai City is in the north of Shicheng, Ninghai City is an important part of the old leading military defense system of Shanhaiguan, and is the most complete and largest Ming Dynasty military camp in China. The trapezoidal total length is 899 meters. It has the "General Administration of the General Administration" on the right and the "Longwuying" on the left. There are also the honorable achievements of the pioneer generals, and the Dragon King Temple and Guandi Temple, which ask the gods to protect.