Colorado may be famous for its mountains. But The Great Sand Dunes flip your expectations completely. Here, the tallest sand dunes in North America rise against snowcapped peaks. Its beautiful, strange and memorable. This park is where nature shows off its creative side. First Impressions. The first glimpse stops you in your tracks. Gigantic dunes tower above the valley floor. They look smooth, golden and almost surreal. The Sangre De Cristo mountains rise sharply behind them. It looks like two worlds collided perfectly. Silence, mountains, desert and sky all meet here. You know straight away that this is a special place. You need to be in good shape for hiking.…