Very well put together thread:
A few sites that I can think of(hopefully not already posted): the Museum of Science, NE sports Museum which I think relocated from Cambridge to the Fleet Center, old stadium site at Northeastern, Boston Fire Museum, State House, USS Constitution(the old Hancock Observatory exibits should be set up there).
I watched a segment on NECN about a new book that list free sites to visit in the Boston Area. There were many great places that I have never heard of. I will try to buy the book and post the link and some of the sites here.
