Castlemore Castle, locally also known as Castle More or Dundrinan Castle, lies next to the entrance of the Castlemore Quarries, northeast of the town of Crookstown, in County Cork in Ireland.
Castlemore Castle was probably built soon after the MacCarthys obtained this district in the mid-15th century. It was one of their chief seats in Muskerry. By the late 16th century it was held for them by the MacSweeneys and its importance diminished. In the later 17th century it was occupied by John Bayley, passed to the Rye family and then the Travers family.
The remains of Castlemore are very much overgrown, so it is hard to get a good idea of its condition. The growth also makes entering the castle impossible. So there is not much detail to be seen. Keep an eye out for the passing lorries of the busy quarry.