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In this Dec. 18, 2010 photo, a visitor walks down the natural entrance 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. (AP Photo/Susan Montoya Bryan)

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