Here we are at the Frank Lloyd Wright designed Darwin Martin House in Buffalo, N.Y.. There was no photographing inside, but I did take some photos of these classic photos in the Welcome Center. Originals belong to them and Frank Lloyd Wright. Here is the Martin family at the giant arched hearth in the main house. The fireplace must be 10-12′ across at the outside of the arch.
Here is a photo of Frank Lloyd Wright early in his career in 1905 when this house was constructed: