A summer thunderstorm threatens over the tall dunes at Great Sand Dunes National Park.
Great Sand Dunes National Park, Colorado - an approaching summer storm threatens the calm of a desolate landscape dominated by huge sand dunes. In the foreground, one of the few trees in the area has fallen and succumbed to the elements, while low sage grass thrives around it.
The full moon sets behind the top of an alpine peak in the central Rocky Mountains of Colorado's.
