ARTISTIC PHOTOS Great Sand Dunes National Park. (Dunes126)Great Sand Dunes National Park. (Scenic096)Great Sand Dunes National Park. (Dunes129)Prairie sunflowers (Helianthus petiolaris) growing at Great Sand Dunes National Monument. (Dunes160)Abstract sunset reflection in water. Alaska. (140902-6425)Water flowing through Great Sand Dunes National Monument. (Dunes159)Great Sand Dunes National Monument. (Dunes152)Fall aspen leaves float on top of a calm pool of water. San Luis Valley, Colorado. (Scenic187)Great Sand Dunes National Monument. (Dunes135)Great Sand Dunes National Park. (Dunes127)Blowing sand, Great Sand Dunes National Park, San Luis Valley. (Dunes030)Sunrise over Great Sand Dunes National Park, San Luis Valley. (Dunes012)Dunes and reflection. (Scenic360)Great Sand Dunes National Monument. (Dunes151)Aerial of Cotton Lake. Dry wetland on Medano Ranch, Great Sand Dunes National Park, San Luis Valley. (Dunes092)Cumulus clouds. (080725-00292)Sunset and prairie sunflowers (Helianthus petiolaris), Great Sand Dunes National Park. (Dunes007)Abstract sunset reflection. Alaska (150803-1170965)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)Autumn branches. (Dunes114)Lenticular clouds over Devil's Head. (120115-6089)Great Sand Dunes National Monument. (Dunes125)Great Sand Dunes National Park. (Dunes131)Water fowl. (Dunes049)Great Sand Dunes National Monument. (Dunes168)American coots landing in water. (WaterFowl049)Great Sand Dunes National Park. (Dunes128)Coyote tracks and prairie sunflower at Great Sand Dunes National Park, San Luis Valley, Colorado. (Dunes080)Great Sand Dunes National Monument. (Dunes164)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)Ducks taking off at sunrise. (Waterfowl141)Windswept sand of Killpecker Dunes in Wyoming's Red Desert. (RedDesert011) PHOTO LIBRARY MENUMENUAERIALS / FLORA / SCENICSAMPHIBIANS / REPTILESARTISTIC PHOTOS / PEOPLE / STRUCTURES / TRANSPORTATION Artistic PhotosBuildings / StructuresOutdoor ProfessionalsPeopleTransportation BIRDSBUGS / INSECTS / SPIDERSMAMMALSMARINE LIFEPLACESURBAN WILDLIFE