The three people at the bottom of the frame give a sense of scale to the sand dunes at the Great Sand Dunes National Park, Colorado.

AmericacloudsColoradoDaydesertduneDunesGlory of CreationGreat Sand DunesimageLandscapeNational ParknatureOutdoorOutdoorspeoplePerspectivephoto2009PhotographypictureSandsand dunestallThomas RobinsonverticalGreat