On the way down south, we stopped at the VERY cool Duke Energy Children's Museum in Cincinatti in the Union Terminal building. I would highly recommend it to anyone; we could have easily spent the whole day...
This was an almost life size, stylized replica of some sort of scoop tractor complete with "rocks" that the kids could shovel into the dumper and other kids could dump out (yes Brittany, Gavin would be in heaven!)

The Lego room...

We had to drag them out of this area, even Ava, who was ecstatic that the tables were low enough that she could climb on them!