Great Sand Dunes National Park May 1, 2015 by jerry Fornarotto Leave a Comment A cattle skull bleached in the sun at the Great Sand Dunes National Park and Preserve. Dunes, Great Sand Dunes National Park “Skull in the Desert” Great Sand Dunes National Park, CO. Dunes, Panoramic Related posts: Arches National Park Badlands National Park, South Dakota Bryce National Park Waterton National Park, Canada