Introduction to the stalactite hanging plaque: The stalactite hanging plaque is a unique wonder of Yanzi Cave. On the stalactite hanging from the top of the cave 50 meters high from the river, there are thousands of plaques from past dynasties. The local farmers climbed up the cliff with their bare hands, which is amazing. At present, private hanging of plaques is no longer allowed, but the government has unified the hanging of a plaque on the Jianshui Swallow Festival on August 8 every year.