The New Hall Military Museum is a good, small museum that opens during the summer. Its free and gives a good amount of naval history too. It has some models and figurines which look pretty cool. Good place to visit if youre in the area, but not something you want to have to purposely find parking and make an hour drive for. At the same time, its smack dab in the middle of a gazillion other museums so if youre in the area, you might as well see it too.
Looks beautiful from outside
Although one of the smaller museums in historic Philadelphia, it contains some interesting military artifacts and information.
Nice, hidden museum in Philly with cool models and artifacts on display.