Introduction to Lingguan Hall: Lingguan Hall was built in the early Ming Dynasty to worship Lingguan, the "three-eyed king" in Taoism. There is an ancient ginkgo tree in the courtyard that is over 500 years old and requires three people to hug it. It is a national first-class protected tree. This ancient ginkgo tree has also witnessed the development and changes of Longsi Ecological Park.