Esplorando il Parco nazionale delle ‘Carlsbad Caverns’

This Dec. 18, 2010 photo shows hundreds of cave formations that decorate the Big Room at Carlsbad Caverns National Park near Carlsbad, N.M. Adventurous visitors can opt for several “off-trail” tours guided by park rangers through narrow passage ways, across slick flow stone and down ropes and ladders. (AP Photo/Susan Montoya Bryan)

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