South Dakota's Black Hills might not be the most well-known travel route in the U.S., but that's part of the allure. This region blends history and scenery in a way few others can. And that's because a drive from 1-90, and into the Badlands Scenic Byway will take travelers through the stunning cliffs and multi-colored spires of Badlands National Park. Other notable sites in the area? Mount Rushmore (George Washington's profile can be seen in the image above).