County Roscommon: See
Roscommon Castle was Norman, re-modelled in early modern times but demolished under Cromwell.
Also in Roscommon town see Harrison Hall and the town museum. Only the facade remains of the Old Gaol.
Rathcroghan in the village of Tulsk, midway between Roscommon and Boyle, is an extensive archaeological site occupied from Neolithic to Iron Age times, with burial mounds, ringforts and medieval field patterns. Notable sights are the Rathcroghan Mound, the cave of Oweynagat, the Mucklaghs earthworks, and the Cairns.
Arigna Mining Experience: see Drumshanbo for this museum in a former coal mine.