Introduction to Tianshengqiao: Tianshengqiao Hot Spring is located 10 kilometers southeast of Zhongdian County, Yunnan. The east-west flowing Shudugang River crosses the underground cave and forms a natural limestone bridge. The bridge is more than 60 meters high, 10 meters wide and about 200 meters long. The bridge deck is flat and straight, quite like an artificial creation. Walking on the bridge, it is strange and dangerous. The cliffs on both sides are like knives and axes.