(Managed in conjunction with the Roscrea Heritage Society) The stone castle consists of a gate tower, curtain walls and two corner towers dating from the 1280's. The castle rooms are furnished and some house exhibitions. Built in the early 18th century in the Queen Anne style, Damer House is an example of pre-Palladian architecture. Its rooms house temporary exhibitions. One of the rooms is furnished in period style. It also has a restored mill displaying original St Cronan's high cross and pillar stone.