Introduction to Wengcheng: Wengcheng, Panmen and Luchengmen have two gates facing the same axis. There is a square open space about 20 meters long in the middle. The surrounding walls are steep. Once the enemy is lured deep, the gate will cut off the retreat. It is like catching a turtle in an urn, and you can get everything. The victory of annihilation. Wengcheng was rebuilt by Zhang Shicheng in the late Yuan Dynasty and continued to be repaired by the Ming and Qing dynasties. It still has its original shape.