Jewel Cave National Monument in Custer, South Dakota is the third longest cave in the world. We took a cave tour and were able to see some amazing cave formations. This cave has been a national park area since 1908.
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| This map shows the 195 miles of mapped passages. It is estimated that only 4 percent of the cave is mapped. |
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| Historic entrance to Jewel Cave |
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| This formation is known as Bacon, it is 20 feet long and 1 foot wide. |
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| This is called cave popcorn. |
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