The 18 mile Iron Mountain Road in the Black Hills of South Dakota is one of the most fun, beautiful, and exciting roads that exists in all of the American West. It has pigtail bridges where the road circles underneath itself in a dizzying (literally) circle of engineering marvel. The whole road is an incredible engineering feat. There are three tunnels with one of them being the incredible Scovel Johnson Tunnel which perfectly frames Mount Rushmore as you drive through it. There are also incredible lookouts and a section of the road that is separated into a single lane for each direction of traffic. Every time I drive that part it reminds me of the mine cart chase in Temple of Doom. This is one of my favorite roads in the country and it is a highlight of the Black Hills.

The road (16A) was created in 1933 and it connects Mount Rushmore National Memorial to Custer State Park.