Introduction to the city gate: Niangzi Pass has a long history. Weize County was established here during the Kaihuang period of the Sui Dynasty. Princess Pingyang, the sister of Emperor Taizong Li Shimin of the Tang Dynasty, once led the women's army to guard this pass, so later generations called it Niangziguan. The existing Guancheng was built in the 21st year of Jiajing in the Ming Dynasty (AD 1542). It has two gates in the south and east and a 650-meter-long city wall, with a residential area in the middle. The south gate of the city has a brick coupon at the bottom and a gate tower at the top. Above the city gate are the four characters "Gyeonggi Fanping" on the front of the book. In front of the gate is an ancient carriage and horse road paved with stones of nearly 100 meters. The city gate tower is built on the door opening.