In Longyan Mountain, 28 kilometers northwest of Zunyi City, there are buses to and from Hailongtun at the bus stop in front of Zunyi Maocaopu Bus Terminal. Hailongtun is 1354 meters above sea level, about 1.59 square kilometers, is a Tusi Castle site from the Song Dynasty to the Ming Dynasty, the only world cultural heritage in Guizhou. There are 9 customs in Hailong hoard, 6 customs in front of Tun, and 3 customs in the back of Tun. Each one is guarded according to the danger, especially the 36-level ladder, which is breathtaking. The Yang family of Taiyuan came to Bozhou, which is now Zunyi area. It was not easy to rule here for more than 700 years!