Introduction to Thunder Cave Smoke and Clouds: Between Baiyunting and Jieyin Hall, the mountains are secluded and the roads are remote and famous for being strange and dangerous. Literati in the past dynasties often described the coldness of the mountains and the etherealness of the smoke and clouds with the words "deserted smoke and dense mountains", "empty rocks and ten thousand mountains", and "ten thousand forest rows", and marveled at the deep and quiet beauty of this place.