Another one we like is Fallingwater. This place seems very alive, and appears to grow out of the site, made out of the same rock and earth (click to enlarge). The horizontal planes and vertical stone walls look like features that would fit well in our own site.
We’ve heard that the engineering in the place was faulty, however, and there have been some heroic efforts lately to keep the cantilevered concrete slabs in one piece. The lesson there is to know your materials, and to not sacrifice good structural integrity to artistic imagery.