Clonfert Monastery and Cathedral is a religious building founded by St Brendan in the 6th century. Its abbey church became St Brendan's Cathedral. The oldest part of the present church dates from about 1180. It is Romanesque in style, with carved motifs of human and animal heads and foliage. Its southern transept, which has fallen into ruin, dates from this period; a later northern transept, in the Gothic style, has been removed.
St Brendan's Cathedral is the Catholic cathedral of Loughrea. Although designed in a neo-Gothic style, it houses perhaps the largest collection of neo-Celtic art and craft in Ireland. Its most notable feature is the extensive collection of stained glass windows created by the Dublin studio An Túr Gloine.
St Mel's Cathedral is Longford's Catholic Cathedral. Built in the neoclassical style between 1840 and 1856, the belfry and portico are later additions. Its interior was ravaged by fire on Christmas Day 2009.