Introduction to the Taishan Underground Rift Valley: The Taishan Underground Rift Valley is a fault zone between the two mountains of Mount Tai and Mount Culai. It is more than 1,300 meters long and is closely connected with underground caves. The overall sightseeing length of the rift valley is more than 6,000 meters, and the mysterious beauty of stalactites in the cave forms a magical and wonderful picture.