We also visited the National Museum of the American Indian, a relatively new Smithsonian museum that I had visited after it first opened. I remember not liking it much then, and still am not enamored with it, although some of the displays are interesting.
This is the gigantic dome that sits above the copper basket (previous picture) in the Potomac Atrium.
Leaning Tower of Niles Water Tower, Niles, Illinois, posted earlier: