Get a sneak peek inside the impossible ice cave that stay frozen through summer The dazzling sight inside the Ningwu cave in the mountains of Shanxi Province in ‪China‬. The walls and floor of Ningwu cave are coated with slicks of frozen water. Ice stalactites stretch down from the ceiling, towards ice stalagmites reaching up from the floor. The Ningwu cave alone sees up to 1,000 visitors a day when it’s open to the public between May and October. Each tourist might spend an hour in the cave, which is illuminated for them by 200 light bulbs. Both the tourists and the bulbs give out heat.(Photo/People.cn)