The kids might also enjoy a tour of Laurel Caverns.
Adults would be more appreciative of Frank Lloyd Wright's Fallingwater.
My wife would love to see Fallingwater. If we're ever in the area, we'll go see it.
A friend of mine has a brother who cast in bronze a working (capable of being fired) model of a cannon from that era in high school as a science fair project. I saw the thing, really beautiful. Imagine trying that for the science fair in today's America.
Has it fallen yet? I understand that there are major structural problems with the cantilevered decking.