You've also got the Paul Revere trail in Boston, Sturbridge Village in Sturbridge Ma, lots of stuff on the Harbor Islands.
Lexington and Concord [Arlington now?] battlefields. The Aquarium, The Science Museum, lots of stuff in Salem Ma.
Loads of good Irish bars
There's way too much to list, Boston probably has more history than anywhere else in the US, and it's all crammed in relatively close. You can travel from New Hampshire to south of Boston in an hour and a half.