Frank Lloyd Wright’s Fallingwater, completed in 1939, was built in collaboration with the Kaufmann family as their summer home in Bear Run, Pennsylvania. Known as one of the greatest accomplishments in American architecture, Fallingwater was built in harmony with the environment, utilizing natural rock formations to leap over the waterfalls in a cascading series of cantilever platforms. The interior is regarded with equal attention to bringing elements of the outdoors in by strategically avoiding materials that would obstruct the panoramic view of the trees, and building in a staircase from the common room to the pools below where Mrs. Kaufmann would bathe in the mornings.