Yellowstone, Badlands, Mt Rushmore? From Cincinnati

I'm glad to see that they've improved the Minute Man Missile park site:

NPS

When we were there the park consisted of a mobile home and they ran tours, which were at the silo 20 miles away, only 2 or 3 days a week.

We really enjoyed the Badlands too, the KOA south of the park at Interior is excellent. We spent 5 days there last time and had plenty to do. There is a fabulous mineral museum in Rapid City, well work a visit if that sort of thing interests you. Link