[From my personal collection]
Thanks to the magic of the 2013 YouTube video below you can see the sites along the road which hasn't changed much since it was built in 1922.
And if you want to see for yourself if a tour bus can fit through that narrow tunnel, you can satisfy your curiosity here:
*Part of the Peter Norbeck Scenic Byway.
**Since I was only two years old at the time I have no memory of this.