Introduction to Bagua City: The Bagua City under Huangya Pass was built in the Ming Dynasty, with a circumference of 707 meters, and three passes and nine gates. According to the Fuxi Bagua Diagram, it is "Qian, Kan, Gen, Zhen, Xun, Li, Kun, Dui". The hexagram pattern organizes the street network with more than 40 streets, connected by only one or two gatehouses. This is the "Bagua Enchantment Formation".