Fallingwater, also known as the Edgar J. Kaufmann Sr. Residence, is a house designed by American architect Frank Lloyd Wright in 1935 in rural southwestern Pennsylvania, 50 miles southeast of Pittsburgh.  The house was built partly over a waterfall.

At the time of its construction, the house cost a total of $155,000. Broken down as follows: house $75,000, finishing and furnishing $22,000, guest house, garage and servants quarters $50,000, architect's fee $8,000. Accounting for inflation, this translates to about $2.3 million in 2007 dollars.