Esplorando il Parco nazionale delle ‘Carlsbad Caverns’

This Dec. 18, 2010 image shows a visitor taking a photo of a cave formation inside Kings Palace at Carlsbad Caverns National Park near Carlsbad, N.M. The park has been offering adventure tours since 1995. Aside from giving tourists a chance to see parts of the cave that are normally off-limits, the tours help rangers educate visitors about just how fragile the caverns are. (AP Photo/Susan Montoya Bryan)

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