Fallingwater is more than work of art, it is a religious experience. I visited it three times (each time my visit to Pittsburgh and the area surrounding the house was to specifically see it) and every damn time I stood weeping leaving the tour.
If you ever visit Taliesin in Wisconsin (which has a pretty bland), you should also visit the nearby House on the Rock which is a fascinating and very weird collection of esoteric and kitschy items.
The contrast in attitudes and aesthetics between the two is incredibly stark, and it's very interesting to see the reactions of visitors to each location.
I'm sad that we're coming up towards 100 years on from Fallingwater being built, and yet the American preference for new houses of a similar price (after inflation) is the sort of awful stuff that shows up on mcmansionhell.com.
People want square footage and comfort, not design. Frank Lloyd Wright homes look stunning in an Architectural Digest spread, but living in them is not really up to par for modern standards.
The contrast in attitudes and aesthetics between the two is incredibly stark, and it's very interesting to see the reactions of visitors to each location.