A lovely 3D openly accessible and modifiable model of the house and environment was created by Myles Zhang on Sketchfab.com [ Download Resources ] using 3D model source files originally by nottamun on 3dwarehouse.sketchup.com.
Fallingwater in Unity3D
I extracted the Collada (DAE) model of Fallingwater with its associated textures and imported those to Unity3D adding in some surrounding terrain. The trees and bushes were mostly replaced using Unity3D free assets and waterfall details were added and animated. Building and ground lighting was added, along with a day/night cycle. Doorways are not animated, so some of these were made into phantom (non-colliding) objects so an avatar can walk through them. Some pathways, corridors, doors and stairs in the house are not accurately modelled and can cause an avatar to get stuck, so some invisible barriers were put in place to help prevent this.
Fallingwater in Sinespace
The build was then loaded in the multi-user virtual world Sinespace… it can be visited by searching for “Fallingwater” in the “Explore” panel in the Sinespace viewer.
Fallingwater in Sinespace via a Browser/WebGL
A WebGL version may work for some via this link… http://sine.space/locations/fallingwater
These diagrams are included with the Fallingwater model by Myles Zhand and nottamun…