Built c. 1500 by the Earl of Desmond as a custom house, this is a well-preserved tower house. The Castle is known locally as the French Prison following a fire in which 54 French prisoners died in 1747. The building was later used as an ancillary workhouse during the Famine. Admission €2.90, covered by Heritage Card, open Apr-Oct daily 10:00-18:00, last entry 17:15, tours given on request, closed Nov-mid Apr.