This Museum is free and is located in Dayton, Ohio. My wife and I recently visited - I was very impressed with the displays. Here I am with a Spitfire behind me:
A lot of German equipment was on display. Here is a JU-88:
Here is an ME262 - awesome design:
Here is the B29 "Bocks Car" that dropped the FAT MAN bomb on Nagasaki:
Other items on display included a quad 20mm AA gun, a V2 rocket, and a FW190. We just saw the WWII section due to time constrictions but there were planes from all eras. Anyone passing by there should check it out!
"Most sorts of diversion in men, children, and other animals, are in imitation of fighting." - Jonathan Swift