Black Hills, South Dakota

Image 17 of 40

Wind Cave National Park

20170521WindCave0036.JPG

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Boxwork, a rare type of mineral structure, is pictured within Wind Cave at Wind Cave National Park in South Dakota on Sunday, May 21, 2017. (Photo by James Brosher)
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Copyright © 2017 James Brosher, all rights reserved
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Boxwork, a rare type of mineral structure, is pictured within Wind Cave at Wind Cave National Park in South Dakota on Sunday, May 21, 2017. (Photo by James Brosher)