Jewel Cave National Monument

Jewel Cave National Monument contains Jewel Cave, currently the second longest cave in the world, with just over 157 miles (253 kilometers) of mapped passageways. It is located approximately 13 mi (21 km) west of the town of Custer in South Dakota's Black Hills. It became a national monument in 1908.

Read more about Jewel Cave National Monument:  History, Exploration, Hydrogeology, Visitation

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    What difference is there, do you think, between those in Plato’s cave who can only marvel at the shadows and images of various objects, provided they are content and don’t know what they miss, and the philosopher who has emerged from the cave and sees the real things?
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