More than 350 miles of passages have been mapped in this longest cave
Archive - Show #5227, aired 2007-05-08 [PAR] May 8, 2007 ... California has the tallest trees, tallest dam, and tallest waterfall, ... More than 350 
miles of passages have been mapped in this longest cave... [DOC] [TLE] Mammoth Cave National Park [PAR] ... to the underground caverns, the park preserves some 80 square miles--more 
than ...