In the center of the National Portrait Gallery is the square-foot Robert and Arlene Kogod Courtyard which was designed by Norman Foster. Conde Nast Traveler named the structure one of the seven modern architectural wonders. National Portrait Galler
RV House / Alejandro Restrepo Montoya + Camilo Andrés Mejía Bravo + Andrés Felipe Mesa Trujillo
This coincides with the last one, solid walls on tracks with hidden seams, then you can flip them out and stuff to open up the walls for parties, you can even do two frenchdoors that actually work and still have the sliding doors!