Fallingwater is a house in the Mill Run section of Stewart Township, Pennsylvania, United States, designed by the architect Frank Lloyd Wright in 1935. Situated in the Laurel Highlands of southwest Pennsylvania, about 70 miles southeast of Pittsburgh, it is built partly over a waterfall on the Bear Run river. The house was designed to serve as a weekend r…Fallingwater is a house in the Mill Run section of Stewart Township, Pennsylvania, United States, designed by the architect Frank Lloyd Wright in 1935. Situated in the Laurel Highlands of southwest Pennsylvania, about 70 miles southeast of Pittsburgh, it is built partly over a waterfall on the Bear Run river. The house was designed to serve as a weekend retreat for Liliane and Edgar J. Kaufmann, the owner of Pittsburgh's Kaufmann's Department Store.