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