Renwick Gallery on Pennsylvania Ave and 17th Streets. Although you can't really see it in this photo, the motto carved into the top of this building is “Dedicated to Art.” I found this funny since this building is basically right across the street from the White House, whose current occupant has never displayed any dedication to or interest in art, as far as I know. And it's not just the current occupant; the U.S. generally displays a sad level of support and appreciation for art, in my opinion. But whatever. This looks like a cool building and maybe I'll have time to stop in someday and see what's inside. According to its website:

The Smithsonian American Art Museum's Renwick Gallery collects, exhibits, studies, and preserves American crafts and decorative arts from the nineteenth to twenty-first centuries. Housed in a historic architectural landmark across the street from the White House, the Renwick features one-of-a-kind pieces created from clay, fiber, glass, metal, and wood.

The building is also a movie start—it apparently appeared in the movie “Dave.”