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Wind Cave National Park, South Dakota

Below: A herd of 30 buffalo crossed the road right in front of us! Is that reasonable?



Below: Wind Cave has over 142 miles of underground passageways. Our tour guide took us down 220 feet below the surface.



Below: Some of the mineral deposits looked like icing on the walls.



Below: There were intricate calcite boxwork formations on the ceilings.



Below: Back on the surface, a prairie dog family was enjoying the sunny day.