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.