If you haven't been to the National Museum of the US Air Force at Wright Patterson AFB in Dayton, OH, you've missed the chance to stand next to a MK 17 Thermonuclear bomb and the B-36 that was designed to carry the 45,000 lb. monster. It's a sobering experience realizing that you're standing next to a thing that can make a city disappear.
For USAF lovers, NMUSAF is Mecca. It has an example of just about everything the Air Force ever flew and planes of adversaries too. Included is the only existing example of the B-70 supersonic bomber, the B-58 Hustler, the B-2, B-1, B-36, B-52, B-29 and so on. Boxcar is there, the other B-29 that dropped the bomb on Nagasaki. F-22 is represented as is the F-23 that lost the competition. The experimental aircraft used to be housed in a hanger within the air base's secure area so you had to take a bus and go through security. Also there was the hanger of Presidential airplanes. They've now built the fourth hanger to house all of this contiguous with the rest of the museum. Engine examples of all major types are there too.
Again, if you're into USAF aviation, this is a bucket list item.