Geopark is a hidden tunnel cave in karst geological heritage as the main built up on the basis of karst geological park, the core area is a hidden tunnel typically controlled by faults, karst geological formation of large caverns, through the rock of the cave dating back about 500 million years of the Cambrian carbonate rocks. Hidden tunnel length of 5180 meters, caves and underground rivers combined, cave karst landscape colorful, exotic spectacular, there are a lot of odd foot scene, exquisitely carved natural stalagmites, stalactites, Shiman, stone curtains, stone waterfall Ishida, dazzling, so that tourists dizzying, immersive wonderland. Known as the "Cave Central China - China hole in the sky" and "Pearl of the mysterious underground palace."