One of the most unique landscapes in the US, you could easily imagine you're in the middle of the Sahara when you visit Great Sand Dunes National Park in southern Colorado. Picture yourself surrounded by towering camel-colored dunes that stretch as far as the eye can see. At dusk, they transform into shimmering shades of gold and fiery orange. And at night, this dark sky zone is home to some incredible star gazing. It's hard to believe this landscape exists in the San Luis Valley surrounded by the Sangre de Cristo Mountains.