We took a break from the heat by visiting the Shenandoah Caverns, where the temperature underground was a refreshing 55 degrees. The price of admission includes a visit to their two other attractions - an exhibit of parade floats from all of the big parades (Rose Bowl, Macy's Thanksgiving, etc.) and an exhibit of old department store window displays. I'd call that a great roadside attraction. We didn't have time for the floats or the window displays, but were impressed with the caverns.
You can see why they call these Bacon. These six-foot-plus formations were once in Nation Geographic.