Penn’s Cave in Centre Hall is the nation’s only all-water cavern.
Penn’s Cave in Centre Hall is the nation’s only all-water cavern. CDT file photo
Penn’s Cave in Centre Hall is the nation’s only all-water cavern. CDT file photo

Road Trip Guide: 10 great caves

May 26, 2014 12:00 AM

UPDATED May 21, 2014 03:53 PM

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