Death Valley National Park has a number of areas where there are sand dunes, some of them inaccessible except with a 4WD vehicle. Mesquite Flat Dunes are right along the main highway through the park and a popular spot. We watched the sunset there one evening, hiking the dunes and waiting for the sun to go down. The sunset did not amount to much but the light and shadows on the dunes were worth the visit and some photos.