Jack Dykinga / Prairie sunflowers (Helianthus petiolaris) catching the sunlight on a sand dune in deep morning shadow. Great Sand Dunes National Monument, Colorado, USA
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Tim Fitzharris / 750 foot tall sand dunes, tallest in North America, Great Sand Dunes National Monument, Colorado
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Jack Dykinga / Prairie Sunflowers (Helianthus petiolaris) flowering on the dunes amid blue morning shadows, Great Sand Dunes National Monument, Colorado, USA.
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Tim Fitzharris / Sand dunes, Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Sagewort (Artemisia sp) on sand dune, Sangre de Cristo Mountains, Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Coyote tracks flowering shrubs on the dune fields in front of the Sangre de Cristo Mountains, Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Grasslands and dunes, Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Storm clouds over Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / 750 foot tall sand dunes rise against the Sangre de Cristo Mountains, Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Rocky Mountain Bee Plant (Cleome serrulata) flower, Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Sangre de Cristo Mountains at Great Sand Dunes National Monument, Colorado
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Tim Fitzharris / Patterns in stream bed, Great Sand Dunes National Monument, Colorado
