The Cathedral of Our Lady Assumed into Heaven and St Nicholas (Irish language: Ard-Eaglais Mhaighdean na Deastógála agus Naomh Nioclás), commonly known as Galway Cathedral, is a Roman Catholic cathedral and one of the largest and most impressive buildings in the city.
Construction began in 1958 on the site of the old city prison. It was completed in 1965, making it the last great stone cathedral to be built in Europe. It was dedicated jointly to Our Lady Assumed into Heaven and to St Nicholas. Link