According to their website, the Enola Gay is on display at the Udvar Hazy Center (the new building located near Dulles). I've been there once before, to the new one I mean, but don't recall if it was out then. I was kind of rushed, I didn't get near enough time there. So this next time I'm going to try to do it right.
There's so many legendary aircraft in there that it's mind boggling. I just found out that they've got the Global Flyer, the plane that Steve Fosset (now declared legally dead after going missing on a routine flight) flew around the world non stop three different times and set three different records in. There's a beautiful symmetry in that the Udvar Hazy center has the Global Flyer, and the main Air and Space building has the Voyager, which held the records before Global Flyer took them. Both buildings have a large, graceful, beautiful Rutan (Burt Rutan, the guy that designed both of them). I just love that, no matter which one I go to I get one of his signature pod and boom designs, either the classic 1980s model or the modern Y2K flavor.