Introduction to Grotto No. 35: Grotto No. 35 is 170 meters deep and has a total area of 12,000 square meters. It is the largest grotto among the caves that have been discovered so far. There are caves within caves in the grottoes, and there are holes under the caves. The structure is strange. There are no murals or Buddha statues in the caves. The chisel marks on the rock walls of the grottoes are neat and beautiful, and they are still as clear as ever. Inside the cave, you can often see crystal clear water that never dries up all year round.