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One of the world’s longest caverns lies beneath the 28,295-acres of Wind Cave National Park. Though its dry atmosphere prevents stalagmites and stalactites from forming, the labyrinth system is peppered with boxwork, a web-like calcite structure. Life above ground proves just as fascinating, with bison, mule deer, antelope and prairie dogs present in conspicuous numbers. A majority of the terrain is covered by short and tall grasses, but anyone who looks closely can also identify white sego lilies, purple coneflowers and golden sunflowers.