Bison in wildflowers. (Dunes154)
Great Sand Dunes National Monument. (Scenic189)
Great Sand Dunes National Park in autumn. (Dunes104)
Shorebirds at sunset. (Dunes069)
American white pelican. (Dunes045)
Sunset and prairie sunflowers (Helianthus petiolaris), Great Sand Dunes National Park. (Dunes007)
Great Sand Dunes National Park sand dunes. (Scenic011)
Sand Creek, Great Sand Dunes National Park, San Luis Valley. (Dunes039)
Great horned owl. (Dunes075)
Great Sand Dunes National Monument. (Dunes125)
Ancient matate discovered at Great Sand Dunes National Park, Medano Ranch, San Luis Valley. (Dunes094)
Prairie sunflowers (Helianthus petiolaris) growing in Great Sand Dunes National Park, San Luis Valley. (Dunes143)
Blanket of prairie sunflowers (Helianthus petiolaris) at Great Sand Dunes National Park, San Luis Valley. (Dunes166)
A handful of prairie sunflowers (Helianthus petiolaris) grow into the dunefield. Great Sand Dunes National Park, San Luis Valley. (Dunes016)
Sand Creek, Great Sand Dunes National Park, San Luis Valley. (Dunes040)
Aerial of Great Sand Dunes National Park, sand dunes, San Luis Valley. (Dunes169)
Great Sand Dunes National Monument. (Dunes161)
Indian Spring at sunset, Great Sand Dunes National Park, San Luis Valley. (Dunes096)
The Ghost Forest, Great Sand Dunes National Park, Colorado. (Scenic451)
Rainstorm at sunset, Great Sand Dunes National Park, San Luis Valley. (Dunes058)
Artesian Big Spring Creek flowing through Great Sand Dunes National Park on the Medano Ranch in the San Luis Valley. (MedanoZapata008)
Great Sand Dunes National Park. (Dunes129)
Rio Grande below Sangre de Cristo Mountains, The Rio Grande originates at the north end of the San Luis Valley and exits into New Mexico at the south end. (Dunes003)
Elk (Cervus elaphus) herd on Medano Ranch, Great Sand Dunes National Park, San Luis Valley, Colorado. (MedanoZapata017)
Reflection of full moon over San Luis lake, Great Sand Dunes National Park, San Luis Valley. (Dunes037)
Snow on fall aspen trees along creek, San Luis Valley. (Dunes113)
Prairie sunflowers (Helianthus petiolaris) blooming in front of sand dunes. (Dunes149)
Red aspen after autumn snowstorm in San Luis Valley. (Dunes103)
Bison in the valley. (Dunes156)
Bison bull in front of sand dunes. Near Great Sand Dunes National Park, Colorado. (Dunes158)
Prairie sunflowers (Helianthus petiolaris) and muhly grass (Muhlenbergia filiformis), Great Sand Dunes National Park, San Luis Valley. (Dunes063)
Prairie sunflowers (Helianthus petiolaris) growing in Great Sand Dunes National Park, San Luis Valley. (Dunes144)
Visitors to Great Sand Dunes National Park enjoy playing in shallow Medano Creek and climbing the 700 foot high dunes. San Luis Valley. (Dunes001)
Dunes and fall color, Great Sand Dunes National Park, San Luis Valley. (Dunes124)
Bachelor herds of mule deer bucks (Odocoileus hemionus) stand in front of the dunefield. (Dunes008)
Dunes and sunflowers in Great Sand Dunes National Park, San Luis Valley, Colorado. (Dunes020)
Sunflowers and sand dunes. (Scenic348)
Coyote tracks and prairie sunflower at Great Sand Dunes National Park, San Luis Valley, Colorado. (Dunes080)
Prairie sunflowers. (Dunes137)
Indian Springs. (Dunes153)
Great Sand Dunes National Park. (Dunes128)
Great Sand Dunes National Park, sand dunes, San Luis Valley, Colorado. (Dunes130)
Great Sand Dunes National Monument. (MedanoZapata007)
Prairie sunflowers (Helianthus petiolaris) in Great Sand Dunes NationalPark, San Luis Valley. (Dunes073)
Dust storm approaching Great Sand Dunes National Park, San Luis Valley. (Dunes017)
Great Sand Dunes National Monument. (Dunes117)
Sandhill cranes flying at sunset. (Dunes053)
Great Sand Dunes National Park, San Luis Valley. (Dunes013)
Great Sand Dunes National Monument. (Dunes014)
Great Sand Dunes National Park. (Baca014)
Aerial of Cotton Lake. Dry wetland on Medano Ranch, Great Sand Dunes National Park, San Luis Valley. (Dunes092)
Rock formation. (Dunes018)
Sunflowers and sand dunes. (Scenic359)
Dune ramp of sand finger pushed up the side of the Sangre de Christo mountains, Great Sand Dunes National Park. (Dunes031)
Ponderosa pine being encroached by dunes in Great Sand Dunes National Park, San Luis Valley. (Dunes028)
Sand Creek at sunset, Great Sand Dunes National Park, San Luis Valley. (Dunes090)
Sunset at Great Sand Dunes National Park. (Dunes062)
Aerial view of Great Sand Dunes National Park, San Luis Valley. (Dunes134)
Aerial of Great Sand Dunes National Monument. (Dunes152)
Blowing snow, Great Sand Dunes National Park, San Luis Valley. (Dunes034)
Prairie sunflowers (Helianthus petiolaris) growing on sand dune at Great Sand Dunes National Park, San Luis Valley. (Dunes081)
Two bison bulls set off the landscape adjacent to Great Sand Dunes National Park.. (Bison008)
Little Spring Creek, San Luis Valley. (MedanoZapata013)
American white pelican at San Luis Lake next to Great Sand Dunes National Park, San Luis Valley, Colorado. (WhitePelican012)
Little Spring Creek, sand dunes, San Luis Valley. (MedanoZapata022)
Ghost Forest near sand dunes, San Luis Valley, Colorado. (Scenic446)
Little Spring Creek, sand dunes, San Luis Valley. (MedanoZapata010)
Prairie sunflowers. (Dunes140)
Flock of sandhill cranes migrating through the San Luis Valley in spring. Monte Vista National Wildlife Refuge, Colorado. (Dunes052)
Prairie sunflowers (Helianthus petiolaris) in Great Sand Dunes National Park, San Luis Valley. (MedanoZapata019)
Blowing sand, Great Sand Dunes National Park, San Luis Valley. (Dunes030)
Great Sand Dunes National Park, San Luis Valley. (Dunes121)
Great Sand Dunes National Monument. (Dunes111)
Great Sand Dunes National Park. (Scenic096)
Great Sand Dunes National Park, San Luis Valley, Colorado. (Scenic5183)
Little Spring Creek, San Luis Valley. (MedanoZapata023)
Great Sand Dunes National Park, San Luis Valley. (Dunes122)
Snowy Kit Carson Peak and Challenger Point in the Sangre de Cristo Range are part of Great Sand Dunes National Park. San Luis Valley. (Dunes027)
Ghost Forest near sand dunes, San Luis Valley, Colorado. (Scenic447)
Pre-dawn sand dunes and reflection. (Scenic361)
Rainbows near Great Sand Dunes National Park, San Luis Valley. (Dunes102)
Sunrise over Great Sand Dunes National Park, San Luis Valley. (Dunes012)
Bison bulls in front of Sand Dunes, sand dunes, San Luis Valley, Colorado. (Dunes004)
Elk (Cervus elaphus) herd on Medano Ranch, Great Sand Dunes National Park, San Luis Valley, Colorado. (Dunes093)
Great Sand Dunes National Park. (Scenic050)
Clouds over Sand Dune National Park, San Luis Valley, Colorado. (Scenic081)
Aerial view of Great Sand Dunes National Park, San Luis Valley, Colorado. (Dunes036)
Great Sand Dunes National Park. (Dunes127)
Great Sand Dunes National Park. (Baca021)
Ghost forest, Great Sand Dunes National Park, San Luis Valley. (Dunes162)
Aerial of Great Sand Dunes. (Dunes005)
Bison and sand dunes. (Dunes155)
Great Sand Dunes National Park. (Dunes131)
Rainbow over Great Sand Dunes National Park, San Luis Valley, Colorado. (Scenic442)
Great Sand Dunes National Park. (Scenic037)
Wheeler Geologic Area is formed by erosion of volcanic tuff and ash. San Juan Mountains at the edge of the San Luis Valley. (Dunes025)
Prairie sunflowers growing in Great Sand Dunes National Park, San Luis Valley, Colorado. (Scenic086)
Great Sand Dunes National Park, San Luis Valley, Colorado. (Scenic006)