A nice little museum, just outside of Concord. I walked out from town (it's a short walk, but there is parking if required), and enjoyed working my way round the all of the rooms in turn.
The history of Concord is fascinating, even for a Brit like me, and it's role in the US fight for independence was not something I knew much about - I do now! As I had been to the North Bridge earlier that day it helped pull all the facts together.
There are exhibits on local authors, not people I read but I know a few more facts for pub quizzes now.
You're not going to spend a whole day here, but if you have a couple of hours spare it's well worth a visit.