The US Smithsonian National Air and Space (NASM) museums are great.
For those that aren’t aware, one of the locations is on the Capitol Mall in Washington, DC and the other - the Steven F. Udvar-Hazy Center - is near the Dulles Airport in Dulles, VA.
The latter has the Space Shuttle Discovery, a Lockheed SR-71 Blackbird, a Concorde… and the Enola Gay.
The Udvar-Hazy Center is utterly amazing. It’s like someone said “hey, you like planes? Here’s all of them. And they’re just there, you can walk up close to them. I took my family for the first time this summer, when we heard they were going to lose the Space Shuttle, and we all loved it.