A girl peers into the shadows of Mammoth Cave, with an expression of wonder.
The darkness of Mammoth Cave has inspired the explorer in humanity for thousands of years - ever since the first person entered its stone halls 5,000 years ago. The shadows beg the quesion: Where does that go? What lies down there? Where would that take me? The call of discovery is as potent today as it has ever been, and the cave has many more secrets.
U.S. National Park Service
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