Introduction to the Natural Stone Tunnel: On the hillside of Ziyang Longdong, the rocks are of various shapes, the stone skin is old and crepey, and there are all kinds of natural stone carvings such as "God Turtle", "Crocodile", "Spike-billed Duck", etc., but this Not surprising. What’s strange is the natural stone tunnels that can be seen everywhere. Most of these maze-like tunnels are about 2 meters high and vary from 1 foot to 1 meter wide. The top and sides are "fully enclosed" stone structures, and people can pass from one end of the tunnel to the other. The longest of these tunnels is more than 500 meters long, and most tunnels are about 10 meters long. How this natural tunnel was formed and how many natural tunnels there are in Ziyanglongdong are still unknown at present.