Introduction to Gongji Tower: Gongji Tower is located south of Zhenshuo Tower. It was first built in the Yongle period and was originally integrated with the ancient city wall. Different from other city gates, there is a gate with a circumference of four miles around the city gate. It is the only gate tower with a gate in Xuanhua City Gate, and the regulations are also the highest among Xuanhua City Gates. (ticket 5 yuan)