This museum in the center of Sligo Town presents a good overview of the county’s history from ancient times to the present day. The most interesting sections cover the region’s extraordinary prehistoric heritage, including a couple of ancient artifacts. (Sligo is, after all, where you’ll find the world’s oldest building by some measures, the Carrowmore Megalithic Cemetery) The other standout sections are devoted to two of Sligo’s most famous residents: the poet W. B. Yeats, whose mother was from Sligo and whose affinity with the county drastically influenced his work; and Constance Markievicz, an aristocrat who grew up in Sligo and went on to become a prominent Irish revolutionary.