A visitor takes photo of the underground canyon in Yishui county, Shandong province, June 7,2016. The underground attraction lies to the southwest of Yishui and covers a distance of 6,100 meters. The spectacular-looking cave was developed from big Karst cracks, inside it are stone columns and stalagmites of various shapes and colors, lit up to form a spectacular landscape.[Photo/Xinhua]
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