What is the tiger head nail on the gate?

The small south gate of Miyun is called "Yingxun Gate". It is said that the old carpenter who works as the gate hated Yang Bo and nailed a tiger's head on the gate, which broke the geomantic omen. The tiger's head nail is called "hanging a tiger upside down", which is one of the new eight scenic spots in Miyun. In the early Qing Dynasty, Miyun was under the jurisdiction of Changping Prefecture. In 8988, it returned to the northern part of Beijing, 8 ...