Introduction to Ancient Vine Penetrating Stone: Among the four wonders of Kowloon Cave, the most peculiar ancient vine penetrating stone is a fibrous tree root as thick as an adult's arm growing out from the middle of an inverted stalactite on the roof of the cave. It is more than ten meters long and floats down. Straight to the ground. The roots are like a girl's long hair, and there are many white new hairs sprouting from the ends, which is very strange.