St Macartan’s College designed by Thomas Duff is a large building of 17 bays in a restrained classical style and was built as the Diocesan college for Clogher. The centre five bays are broken forward with a plain pediment over the middle three. The remaining bays are two storeys with a further three storied pavilion at each end. The rear of the complex contains a quadrangle and tower. The building is sited some distance outside of Monaghan on a hill overlooking the town.