Peter Norbeck Scenic Byway, South Dakota
The 68-mile Peter Norbeck Scenic Byway weaves its way through the Black Hills of South Dakota, where it passes granite pinnacles through tunnels and goes over spiral "pig-tail" bridges. Most visitors come to witness the sheer magnitude of the Mount Rushmore National Memorial, but the Byway doesn't stop there. Just a few miles down the road is Chief Crazy Horse, the mountain-sized sculptural project that (once completed) will be the largest in the world, at 563 feet high and 641 feet long. The route is worth a visit year-round, but is popular during the autumn months when these structures are highlighted by a colorful fall background.
Not to be missed: Staring in awe at the massive memorials showcasing man's will and artistry, as well as taking part in outdoor activities in Custer State Park.
Before you go, check to see when the colors are at peak.
(Photo: South Dakota Tourism)