A rare total inversion was seen on November 29, 2013 by visitors to Grand Canyon National Park. This shot is of the Desert View Watchtower near Desert View Point on the South Rim. The Watchtower is located at Desert View, the eastern-most developed area on the South Rim of Grand Canyon National Park. Recognized as a National Historic Landmark, the tower was constructed in 1932. (National Park Service/Erin Huggins)