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Another very scenic and curvy road is Iron Mountain Road, that connects the Mount Rushmore area and Custer State Park.
An interactive map:
Bison:
There are three narrow tunnels on this road:
One-way road:
Another tunnel:
Pigtail loop road:
Low narrow tunnel:
The third tunnel:
This tunnel has a view of Mount Rushmore:
Pigtail loop road:
One-way roads:
Mount Rushmore view:
A fun drive.