Panorama Point (and Surrounding Area), Badlands National Park
Highway 240, along with I-90, makes a loop through the park with several dirt roads leading off in various directions. From the east, take exit 131 at Cactus Flat; from the west, exit 110 at Wall.
Just before sunset the sun dropped below a thick layer of clouds, illuminating the park with intense and fantastic light, perhaps the best I have ever witnessed. Be prepared to get up very early and stay out well past sunset!