From an Architectural Digest article:

The Glass House, designed by architect Philip Johnson in 1949, when floor-to-ceiling windows were a novelty even in office buildings, is a work of art in itself. But there’s much more art to be found on the lush grounds of this famous home in New Canaan, Connecticut. Amble on over to the Painting Gallery, which houses large-scale works by Frank Stella, Andy Warhol, Robert Rauschenberg, and Cindy Sherman, among others, or the Sculpture Gallery, featuring works by such artists as Michael Heizer, George Segal, Frank Stella, and Bruce Nauman. 

http://theglasshouse.org/