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 Photo taken on July 17, 2006 shows an entrance to one of the Huashan Mysterious Grottoes in Huangshan city, east China's Anhui Province. Thirty-six grottoes, two of which are beneath water surface, have been discovered here, while their history, including when and why to be built and stone materials used remain unknown. (Xinhua Photo)
 Boatman waits for tourists at the entrance to the No. 24 grotto. (Xinhua Photo)

 Tourists walk in the No. 35 grotto. (Xinhua Photo)
 Tourists stroll in front of the mouth of the No. 35 grotto. (Xinhua Photo)
 Tourists view a hall in the No. 5 grotto. (Xinhua Photo)
Editor: Wing
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