Introduction to Longtai: Longtai is located at the top of Shenlong Mountain, with an area of more than half a hundred acres, surrounded by cliffs, and can only be reached by the four gates from the east, west, south and north. Each gate has an upper watchtower and a lower urn city. They are four excellent gateways. They are shaped like the spine of a coiled dragon and have their own core called Yifeng Mountain. Longtai is the political, military, economic and cultural center of Yifeng City. In addition to military defense buildings such as four watchtowers, an urn city and a city defense tunnel at the gateway of Pakistan, it also has a Songjing well that has lasted for thousands of years, as well as residential buildings, sacrificial dams, song and dance theaters, commercial streets, Buddhist temples and other structures. It is a typical castle society.