The following is a proposal for a road trip to Beaver Run, PA on March 15th to go visit Fallingwater:
The first image is from the foundations website, and the second is from an article about the story behind the gift shop built on the grounds. I will leave the general back story of the project to Wikipedia, and focus on logistics for the trip. The trip from Philly is close to 300 miles, depending on the route taken. Guided tours run every half hour until about 4pm, and cost $25 per person.
Travel option A: Pennsylvania Turnpike. 552 miles round trip, $51 in tolls round trip, 4h26 estimated one way duration. Travel option B: I-95 and I-70. 592 miles round trip, $24 in tolls round trip, 4h50 estimated one way duration and a nice diner along the way. A car with four people in it could expect $25-35 in travel expense per person depending on route and gas mileage.