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Inside the Carlsbad Caverns

The Carlsbad Caverns are a sprawling underground site with over a hundred caves. A century ago this year, it was named a national monument. Seven years later, it became a national park. As the decades have gone on, more and more people have visited the site to see the underground wonders we know about – and explore the ones we don’t yet. Jeff Glor reports.
Source: CBS Minnesota

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