Great Sand Dunes National Park and Preserve is located in south central Colorado. It is, as the park site states:
The tallest dunes in North America are the centerpiece in a diverse landscape of grasslands, wetlands, forests, alpine lakes, and tundra. Stay on a moonless night to experience this International Dark Sky Park’s starry skies.
I never ceased to be amazed by the beauty of the natural world.
9×12 hot press Arches, 140#, gouache.
Ink, Yarn & Beer 
That’s a fine job!