St. Patrick's Cathedral, Armagh

St Macartan's Cathedral is the Catholic cathedral of Monaghan. It was built between 1861 and 1893 and is the only Catholic cathedral in the county. The architect James Joseph McCarthy (1817-1882) was in charge of the works and designed the cathedral in a 14th-century Gothic architectural style.

St Patrick's and St Colman's Cathedral is the Catholic cathedral of Newry, built between 1825 and 1829. The former Cathedral of Christ the Redeemer in Dromore, reclaimed by the Anglicans, was burnt down during the Irish Rebellion of 1641, and rebuilt by Bishop Taylor 20 years later; the Catholic cathedral was then built. The cathedral, however, was moved 200 years earlier to Newry, the largest town in County Down, and strategically located at the end of Carlingford Lough.

Ardboe Monastery is an ancient monastery founded in 590 by Saint Colman. In the 16th century, the old church built by St. Colman gave way to the present church (in ruins). The entire monastery was destroyed by fire in the 20th century. One of the main remains of the former monastery is the High Cross, the first one built in Ulster. There are a total of twenty-two panels of Old and New Testament scenes on all four sides of the cross.