New Mexico's Carlsbad Caverns is a system of 119 ancient caves hidden below the landscape, formed when sulfuric acid dissolved limestone that surrounded it. The climate inside is cool, and makes an exciting stop for caving, either on a self-guided or rang
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presidents George Washington, Thomas Jefferson, Theodore Roosevelt and Abraham Lincoln are sculpted on Mount Rushmore National Memorial in the Black Hills region of South Dakota, U. National Park Service photo taken on April