Road Trip

My mother and grandmother and I are plotting a road trip west, visiting various people and attractions in Ohio and Iowa. Because of the way these united states are arranged, there will also be a good deal of driving through Pennsylvania, Illinois, and Indiana. Right now, current plans seem to place this trip around the beginning of October.

Off-hand, I don't recall any of you being in this area, but have I forgotten someone who would like a couple of hours of visit? (No promises.) Or suggestions for must-see things we'll be driving past?