Introduction to Yuguan: At the gate of Huayuan West Road, there is a section of city wall more than 20 meters long. There are crenellations on the wall. The word "Yuguan" is written on the stone forehead on the north wall of the doorway. Some experts believe that before the Manchu nobles gained national rule, they lived on the vast land north of Shanhaiguan. The owner of the garden stood on the wall of Yuguan and looked north, with the intention of looking into the distance and missing his homeland; some garden experts believe that it was The garden art of "moving the sky and shrinking the earth in your arms".