Introduction to Guiyun Cave: Guiyun Cave is the most famous scenic spot in Shigong Mountain. The author of the three characters was a native of Yushan, Changshu, Suzhou in the mid-Ming Dynasty. The ancients praised Taihu stones as being like the roots of clouds in the sky, and it turns out that there are many stalactites hanging upside down at the entrance of the cave, which resemble clouds, hence the name.