Esplorando il Parco nazionale delle ‘Carlsbad Caverns’

In this Dec. 17, 2010 photo, a ranger guides visitors past limestone walls lined with “cave popcorn” deep inside Lower Cave at Carlsbad Caverns National Park near Carlsbad, N.M. More than 400,000 people visit Carlsbad Caverns each year to get a glimpse of the monumental stalagmites and stalactites, delicate soda straws, translucent draperies and reflective pools that decorate the park’s main attraction, the Big Room. But only a fraction of visitors get a chance to experience the more extreme tour through Lower Cave or a lantern-lit history lesson in Left Hand Tunnel. (AP Photo/Susan Montoya Bryan)

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