The Cathedral of the Immaculate Conception stands on Waterloo Street in the Waterloo Village neighbourhood, a Gothic Revival building that is the mother church of the Roman Catholic Diocese of Saint John. The present building dates from 1853 with subsequent additions, and its twin towers are a landmark on the uptown skyline.
The interior is calm and well-proportioned, with stained glass windows and stone detailing worth a quiet visit. The cathedral has served New Brunswick's Irish Catholic community — many of whom arrived as immigrants through Partridge Island — since the mid-nineteenth century, and the parish records are an important genealogical resource for families tracing Maritime Irish roots. Entry is generally free outside of services.