Esplorando il Parco nazionale delle ‘Carlsbad Caverns’

In this Dec. 18, 2010 photo, a visitor stops to look at the formations in 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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