'Great Sand Dunes National Monument in this U.S. state changes its shape because the sand shifts'
Colorado
C THE WORLD: Great Sand Dunes National Monument in this U.S. state changes its shape because the sand shifts
Great Sand Dunes National Monument in this U.S. state changes its shape because the sand shifts
Great Sand Dunes National Monument in this U.S. state changes its shape because the sand shifts
"C" THE WORLD
Colorado
"C" THE WORLD