150 Miles Long and Still Counting - Jewel Cave National Monument Passes a Milestone
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The second longest cave in the world just got a little larger—at least in terms of the number of miles of surveyed passages. Volunteer cavers have recently mapped new areas at Jewel Cave National Monument which pushed the total known length of Jewel Cave past the 150-mile mark.
- By Jim Burnett - March 15th, 2010 6:12am