One of the wider corridors in Mammoth Cave
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Looking up above the trail in Mammoth Cave
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Drapery room stalagmite, New Entrance Tour, Mammoth Cave National Park, Kentucky
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1966 Bob Zimmerman and Jack Sullivan in Mammoth Cave, Kentucky
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A bat hanging from a wall in Mammoth Cave
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Ceiling above the Frozen Niagara formation in Mammoth Cave
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Overhang above the Frozen Niagara formation in Mammoth Cave
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Area behind the Frozen Niagara formation in Mammoth Cave
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Area behind the Frozen Niagara formation in Mammoth Cave
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Area near the Frozen Niagara formation in Mammoth Cave
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