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Longyou Grottoes locate near the village of Shiyanbei village is about 180km from Hangzhou. It was unveiled to the world after 17 days pumping in June of 1992. A villager got a fish weighing over 15 kilograms, which aroused grandma Wu’s curiosity. Why not pump the water out and catch the fish? Grandma Wu organized a group of people to pump the reservoirs. After 17 days pumping, water in reservoirs had been removed, an amazing grotto reveals to them instead of numerous fish. It’s really an extensive, marvelous and rare ancient underground world in history, and considered as ‘the ninth wonder of the ancient world’ by the local. It’s really a magnificent underground world with many mysteries. There are 24 grottos having been discovered so far in the 0.38 square km, and overall excavation involved almost a million cubic meters of stone. It is said that the distribution pattern of seven grottoes among the 24 grottos resembles that of the seven stars of the Big Dipper.