Mount Rushmore National Memorial. Prairie dog at Devils Tower National Monument. Alert prairie dog at Devils Tower National Monument. Devils Tower National Monument. Devils Tower National Monument. Devils Tower National Monument. Devils Tower National Monument. Devils Tower National Monument. Devils Tower National Monument. Devils Tower National Monument . Devils Tower National Monument. Lichen is almost fluorescent on the granite. Serene Sylvan Lake. A storm brews over Sylvan Lake. Washington in profile from outside the Mount Rushmore National Memorial. Mount Rushmore National Memorial. Lincoln represents preservation of the nation during the time of the Civil War. Washington, being the first President, represents the birth of the country. Mount Rushmore National Memorial. Peaceful forest around the Mount Rushmore National Memorial. Mount Rushmore National Memorial. Mount Rushmore National Memorial. Mount Rushmore National Memorial. Mount Rushmore National Memorial. Mount Rushmore National Memorial. Mount Rushmore National Memorial. Mount Rushmore National Memorial. Watching out: prairie dogs at Devils Tower National Monument