An excellent museum, if you find yourself across the pond I would also suggest going to Duxford. It is addition to having a world class aviation museum, they also have a large facility that has tanks and other land warfare items. Also on the field are several companies that specialize in rebuilding WW II era warbirds. There is a Dragon Rapid that operates from the field, with rides that are fairly inexpensive, even more so considering that you aren't going find too many places to get a hop in one.
The UK is serious about their history, military and otherwise. You'd have to work to be more than 100 miles away from a really good museum.
http://duxford.iwm.org.uk/