One of our favorite activities in the Black Hills of South Dakota is to take a slow drive along the scenic Iron Mountain Highway where many of the one way tunnels form a picture frame around Mount Rushmore. I also love the unique engineering design in the pigtail bridges used in place of hair pin turns to navigate down the side of Iron Mountain.

We are camped near Custer State Park and the town of Custer in the southern part of the Black Hills at Custer's Gulch RV-Park. It is an OK commercial campground just like dozens of others in this area.

Tunnel on Iron Mountain Scenic Drive in the Black Hills of South Dakota

This is just one of the tunnels on the Iron Mountain Scenic Drive. I included this picture because this tunnel and several others were made to form a frame around Mount Rushmore. Look closely and you can see Washington's head and some of the others as well.

Warning sign on Iron Mountain Highway in the Black Hills of South Dakota

This is one of the "big" tunnels at 10' 6" wide.

Tunnel on Iron Mountain Highway in the Black Hills of South Dakota

You always like to see a falling rock sign when you are about to enter a tunnel on the Iron Mountain Highway Scenic Drive.

Another tunnel on the Iron Mountain Highway in the Black Hills of South Dakota

This is another of those tunnels on the Iron Mountain Scenic Drive that frame Mount Rushmore.

Tunnel on the Iron Mountain Highway framing Mount Rushmore in the Black Hills of South Dakota

This picture may give a better view of Mount Rushmore.

Double one way tunnels on the Iron Mountain Highway in the Black Hills of South Dakota

Here we have two tunnels in a row on Iron Mountain Highway. Note that these are one way tunnels.

Another tunnel on the Iron Mountain Highway that frames Mount Rushmore:Black Hills of South Dakota

This is another tunnel that frames Mount Rushmore. We pulled over here to get pictures.

Tunnel framing Mount Rushmore on the Iron Mountain Highway in the Black Hills of South Dakota

No, that is not any of us. We did not walk through the tunnel rather just taking pictures from this side. I wonder how many of these tunnels frame Mount Rushmore. It seems that every time we go through a tunnel we can see Mount Rushmore.

One lane tunnel on the Iron Mountain Scenic Byway in the Black Hills of South Dakota

There are a dozen or so of these one lane tunnel signs on the scenic drives. Thank goodness there is not a lot of traffic.

Narrow Tunnel Sign in the Black Hills of South Dakota

This tunnel is getting a bit narrow but not as narrow as the "famous" one at the Needles.

Narrow one way tunnel somewhere in the Black Hills of South Dakota

A tour bus can go through this one with probably 6" on either side of the mirrors. Nothing I would want to attempt. Traversing the concrete barriers and other construction obstacles on I-10 through Houston (in our motorhome) was enough excitement for me.

That is all there is.