When traveling around, I have seen many karst caves, which have no new ideas. Therefore, in recent years, I generally do not go to the caves. The Linwu Ancient Cave in Xishan, Suzhou is arranged by a travel agency, which has never been heard of before. Linwu Ancient Cave is located at the foot of Linwu Mountain in Western and Eastern Suzhou. The main body of the cave is limestone of the limestone of the Limestone Period. Its formation time is about 300 million years ago, and its age is at least 250 million years. It is still under development. Therefore, it is an important living material for the study of Geological Science in the Taihu Lake Basin. Linwudong was the name of an old man surnamed Zhang in the Tang Dynasty. When he was 86 years old, he visited Xishan Mountain. When he saw the cave, he wrote four big words "Linwu Ancient Cave" and asked the mason to inscribe the words on the mountain. According to Taoist classics, there are ten cave heavens, thirty-six small cave heavens and seventy-two blessed places, all of which are inhabited by immortals, and Linwu Ancient Cave is the ninth cave heaven. Woodhouse Cave is unique in the world of Dongtian. It is a limestone underground hall type karst cave with low and narrow entrance, wide and unpredictable cave. The uniqueness lies in : there are holes in the cave, which are connected, sometimes narrow and sometimes open, winding and deep, complicated and confusing. The roof of the cave is not high, the underground rocks are forested, and the gap between the rocks is narrow and tortuous. It seems to be a dragon, and people can walk through it. There are countless strange stones and spectacles, wandering around and high and low. Walking in the meantime, concave and convex on both sides, exquisite hollowing, gaps and transverse holes can be seen everywhere. It is said that karst caves can hardly see stalactites everywhere in ordinary karst caves. The first time I saw such a hole, it felt very fresh and strange.