We were very pleasantly surprised in Granite Falls, MN today (KGDB). Stopped for fuel en route from Seattle to Wisconsin, knew nothing of the Fagen Fighters WWII Museum on the field... But the main hangar was open and the PT-19 went out for a spin, so we walked over when they came back.
It's a small town, not particularly close to anything, but this museum is GREAT! We'll definitely make a return trip when we're not trying to cover so many miles in a day.
They have over a dozen planes, and all but three are in flying condition - And two of those three are gliders, and the third is German. They even have a flyable Jenny.
The planes are also beautifully restored, and spotless. They look like they could have rolled out of the factory this morning.
There are some really unique things in their collection like a Waco CG-4A transport glider, a working Link trainer complete with the "plotter table" and the motor and bellows that ran it, and a bunch of other well-restored stuff.
I didn't look in the Bomber Hangar or the Fighter Hangar, but one of the things I'm really interested in going back to see is their WWII control tower, complete with WWII radios. And yes, the tower looked brand new too. I've never seen one like that.
Anyway, I highly recommend it if you're in the area... Or anywhere near the area, since I'm guessing not a lot of people randomly end up in Granite Falls.