Introduction to the ancient city wall of Goguryeo: Chengzi Mountain was once a prosperous town where the Goguryeo people gathered grain and horses. In the scenic area, you can still see the well-preserved ancient city wall of Goguryeo, reservoirs, yellow taverns, and restaurants in the deep ravine jungle. There are many Goguryeo mountain city ruins such as Jiangtai and Bingkeng.