Most recognize the Boston Public Library (1) as a repository of books. What’s most interesting perhaps, to a historian, is its rare books department, which contains such items as 10th-century medieval manuscripts and the presidential John Adams Library. Find family histories galore at New England Historic Genealogical Society, and research your own. History buffs with a sense of whimsy enjoy the Boston Tea Party Ships & Museum (2) that includes holographic guides and a “real” harbor tea dump. In Cambridge, a sprawling home sinks its historical chops into America’s military and literary pasts, as one might guess from its name: Longfellow House-Washington Headquarters (3). It housed Washington during the Siege of Boston. A hundred years later, the prominent poet lived here.