Falling Water, one of Frank Lloyd Wright’s three great projects, was designed and built in the southwestern Pennsylvania Mountains between 1936 and 1939. Utilizing aspects of Japanese architecture, Falling Water was designed to combine the living area of the residents with the exterior natural aspects of the area. This included not only design elements that created very specific effects in regards to perspectives and views but also using local and even site derived materials in the construction. Located in the Bear Run region, the piece of land is part of the Appalachian Mountains.
While not seen by most to be a retreat, Falling Water combines some of the most basic elements of the Shinto, Buddhist, and Taoist traditions…a respect for nature, integration of humans into nature, and a unique derived perception of the world and humanities place in it. It is one of the most reproduced homes in America with pictures, postcards, and even a Lego set being produced.
Xiong Nai Xin Retreat 
FLW is amazing. I went to the Unity Temple in Chicago, but I really want to see the house he designed in WI.