Washington is in the midst of a building orgy, as $2.4 billion worth of new museums, theatres and other arts projects go up. “The grandest plans are taking shape at the Smithsonian Institution, the world’s largest museum complex, which is adding two new museums — the National Museum of the American Indian, on the National Mall, and an immense hangar-style addition to its popular National Air and Space Museum adjacent to Dulles International Airport in nearby Virginia.”