I second this. It is a gem and it is free. When I lived in Cleveland I would go as often as I could. They have a little bit of everything. Beautiful paintings by notable artists, sculpture (they have a thinker) illuminated texts, stained glass, Tiffany silver work, a beautiful garden fountain, there's an arms and armory section that is really cool and you don't see in a lot of art museums. If any of you readers go, find the Cupid and Psyche David painting. It's massive and probably my favorite in the museum.

If the natural history museum is anything like the art museum then it'll be a great experience!