"At 150 miles, Jewel Cave continues to be the second longest cave in the world, following 367-mile-long Mammoth Cave in Kentucky."Link to Jewel Cave National Monument.
Hat tip: the Bu bro.
"At 150 miles, Jewel Cave continues to be the second longest cave in the world, following 367-mile-long Mammoth Cave in Kentucky."Link to Jewel Cave National Monument.
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