Pretty cool being so far under the earth in such a massive underground cave system. Geological formation: The caverns were formed over 350 million years ago when an underground river carved through limestone. Native American use: Archaeological evidence shows Native Americans used the cave for thousands of years, with some artifacts discovered near the entrance. Cold War use: During the Cold War, the cave was designated as a fallout shelter for thousands of people. Early 20th century: Hans Kenna
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