And the lesser known usonian house, Kentuck Knob which is also worth seeing. The two houses are vastly different but about 20 minutes apart. Both houses are extraordinary but make reservations well in advance. They close in winter.
There's a restaurant I wished we had visited nearby, call Dr. McCarthy's Kitchen. It was recommended.
There are other attractions in the area like the Fort Necessity Battlefield which was the opening battle of the French and Indian War.
Nearby Ohiopyle has some of the best white water rafting around. There are many bike and hiking trails in the area as well.
This is a great spot.