In Georgia, the museum at Warner-Robbins is quite good. Tons and tons of planes! Most of them displayed outside, just parked around.
Let's see if I can remember some of what they had there...
B-25, B-29, B-52, B-57, SR-71, C-47, Globemaster, C-119, bunch of C-130 variations, A-3, MiG 17, F-4E, F-100, F-101, RF-101, F-102, F-104, F-105, F-106, P2V Neptune, a British Lightning, and a U-2.
Inside, they have a beautiful F-15 display, a P-40, a P-47, a bunch of choppers and other aircraft. They also have a great display of models.
I haven't been there since 1995, so a lot of things may have changed, but it certainly was an interesting place. It's off of I-75, south of Atlanta.