Great Sand Dunes National Park and Preserve is 38 miles northeast of Alamosa via US 160 and SR 150. Too heavy to rise over the mountains with the winds that carry it northeastward across the flat, semiarid floor of the San Luis Valley, sand settles at the foot of the Sangre de Cristo Range. Deposits accumulating over the course of thousands of years have created a 30-square-mile, stark yet ever-changing sandscape that forms a vaguely eerie foreground for the rugged mountains. Learn More...