They may not have million-dollar endowments or prestigious boards, but across the country, history is quietly accumulating in thousands of unheralded neighborhood museums. “A local museum is a community’s autobiography, a way of saying: This is who we are, and this is how we got here. For researchers, the museums are invaluable archives, whether housed in multimillion-dollar, state-of-the art facilities or inside the stately rooms of storied mansions.”