ARTISTIC PHOTOS Dunes and reflection. (Scenic360)Ducks taking off at sunrise. (Waterfowl141)Blowing sand, Great Sand Dunes National Park, San Luis Valley. (Dunes030)Aerial of Cotton Lake. Dry wetland on Medano Ranch, Great Sand Dunes National Park, San Luis Valley. (Dunes092)Sunrise over Great Sand Dunes National Park, San Luis Valley. (Dunes012)Great Sand Dunes National Park. (Dunes131)Wheeler geologic area is formed by erosion of volcanic tuff and ash. San Juan Mountains at the edge of the San Luis Valley. (Dunes025)People hiking in Great Sand Dunes National Park, San Luis Valley, Colorado. (Dunes032)Great Sand Dunes National Park. (Scenic096)Water flowing through Great Sand Dunes National Monument. (Dunes159)Lenticular clouds over Devil's Head. (120115-6089)Water fowl. (Dunes049)Prairie sunflowers (Helianthus petiolaris) growing at Great Sand Dunes National Monument. (Dunes160)Great Sand Dunes National Monument. (Dunes168)Great Sand Dunes National Park. (Dunes129)Sunset and prairie sunflowers (Helianthus petiolaris), Great Sand Dunes National Park. (Dunes007)Great Sand Dunes National Monument. (Dunes164)Fall aspen leaves float on top of a calm pool of water. San Luis Valley, Colorado. (Scenic187)Great Sand Dunes National Monument. (Dunes151)American coots landing in water. (WaterFowl049)Great Sand Dunes National Park. (Dunes126)Windswept sand of Killpecker Dunes in Wyoming's Red Desert. (RedDesert011)Coyote tracks and prairie sunflower at Great Sand Dunes National Park, San Luis Valley, Colorado. (Dunes080)Autumn branches. (Dunes114)Abstract sunset reflection in water. Alaska. (140902-6425)Great Sand Dunes National Monument. (Dunes135)Great Sand Dunes National Monument. (Dunes125)Great Sand Dunes National Monument. (Dunes152)Cumulus clouds. (080725-00292)Sunflowers growing on sand dunes. (Dunes014)Greater sandhill cranes leave night roost as sun rises through fog. Monte Vista National Wildlife Refuge, San Luis Valley, Colorado. (Dunes011)Great Sand Dunes National Park. (Dunes127)Abstract sunset reflection. Alaska (150803-1170965)Great Sand Dunes National Park. (Dunes128) PHOTO LIBRARY MENUMENUAERIALS / FLORA / SCENICSAMPHIBIANS / REPTILESARTISTIC PHOTOS / PEOPLE / STRUCTURES / TRANSPORTATION Artistic PhotosBuildings / StructuresOutdoor ProfessionalsPeopleTransportation BIRDSBUGS / INSECTS / SPIDERSMAMMALSMARINE LIFEPLACESURBAN WILDLIFE