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When Jewel Cave National Monument was established in 1908, less than one mile of it was documented. Today, we know it's more than 180 miles long -- the third largest cave system in the world! Exploration continues to push the frontier, revealing rare formations and more contributions to science. There is much do discover both above and below ground. Jewel Cave National Monument is located in South Dakota.
© Robert B. Decker. All rights reserved. Retains the sole copyright of the original Jewel Cave National Monument poster image. Any unauthorized reproduction violates international copyright law.
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