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.
The good news is they've just completed some major structural renovation: Stabilized Fallingwater getting itself back together, although I imagine there may still be some cosmetic maintenance to perform. Just the same, it should be in excellent shape when you get a chance to see it!!!