Cold War Horse, a sculpture of a horse in a hazmat suit, stands to remind us about the history of Rocky Flats, a former nuclear munitions plant that is now a wildlife refuge near Denver, Colorado. Unsafe practices and a shoddy cleanup effort is still affecting people, as well as efforts to build on the former site.
The Museum of Fine Art in St. Petersburg, Florida, is small but impressive. I've visited it more or less regularly for years, and they present quality exhibitions in a professional environment. A 2006 expansion allows the museum to offer a cafe and respectable gift shop, in addition to their permanent collection and revolving exhibits. It's a fine way to spend an afternoon, especially if you include the nearby Dali Museum in your itinerary.