This is not really a museum sharing the history of Maine it is mostly an excellent research library. There is just a small exhibit which is currently about Maine food - likely better to visit in the summer when you can also tour the Longfellow House. The small gift shop is well stocked and the price is very reasonable.
Thank you for your visit and your review! It sounds like from your review you were able to visit the library - which is not only lovely but houses collections essential to the study of Maine and New England history. Thanks again for your visit!