Introduction to Da Tuen Gate: Yun Shan Tun is hidden deep in the Yunjiu Mountain Canyon, Qiyanqiao Town, Pingba County, Anshun City, Guizhou Province. In front of the village, there are thick shades of ancient trees and two steep mountains. There is only one winding stone staircase to enter Tuen Mun. On both sides of Tuen Mun, stone walls six meters high and ten miles long were built based on the rocky terrain to connect to the cliffs. They were like the Great Wall winding around the steep mountains on both sides.