Great Sand Dunes National Park, Colorado, United States.

Great Sand Dunes National Park, Colorado, United States.

Great Sand Dunes National Park, Colorado, United States.

Great Sand Dunes National Park, Colorado, United States.

Great Sand Dunes National Park, Colorado, United States.

Great Sand Dunes National Park, Colorado, United States.

Great Sand Dunes National Park, Colorado, United States.

Great Sand Dunes National Park, Colorado, United States.

Great Sand Dunes National Park, Colorado, United States.

Great Sand Dunes National Park, Colorado, United States.