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One Of The World's Longest Caves Is A Hidden South Dakota Crystal-Filled Monument That Literally DazzlesSouth Dakota may conjure up images of Mount Rushmore ... West of the town of Custer lies a literal gem of a destination: Jewel Cave National Monument. Named for the shimmering calcite crystals ...
The State of South Dakota has some pretty famous attractions. Mount Rushmore, Crazy Horse Memorial, The Badlands, Black Hills, the list goes on. But one place that doesn't get mentioned nearly enough ...
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