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The photo taken on Thursday, July 2, 2009, shows an underground ice crystal cave that dates back 3 million years. The cavern, located in Ningwu County, northern Shanxi Province, consists of five floors and runs to a depth of about 100 meters. Various shapes of ice crystals are clear and shining, turning the cave into a crystal grotto. [Photo: Xinhuanet]
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![The photo taken on Thursday, July 2, 2009, shows an underground ice crystal cave that dates back 3 million years. The cavern, located in Ningwu County, northern Shanxi Province, consists of five floors and runs to a depth of about 100 meters. Various shapes of ice crystals are clear and shining, turning the cave into a crystal grotto. [Photo: Xinhuanet]](http://images.china.cn/attachement/jpg/site1007/20090707/000d87ad3cdd0bbce36b0b.jpg "The photo taken on Thursday, July 2, 2009, shows an underground ice crystal cave that dates back 3 million years. The cavern, located in Ningwu County, northern Shanxi Province, consists of five floors and runs to a depth of about 100 meters. Various shapes of ice crystals are clear and shining, turning the cave into a crystal grotto. [Photo: Xinhuanet]")
