St Patrick's Cathedral (Roman Catholic)

Twin-spired Catholic cathedral dominating the second hilltop, with extraordinary mosaic interior

The Roman Catholic St Patrick's Cathedral occupies the opposing hilltop from its Church of Ireland counterpart, creating the famous twin-spired skyline of Armagh. Construction began in 1840 but was interrupted by the Great Famine in 1847 when the Bishop of Armagh diverted building funds to famine relief — the cathedral wasn't completed until 1904.

The exterior, in the Perpendicular Gothic style, is impressive but gives little hint of what lies inside. The interior was decorated through the mid-20th century with extraordinary mosaics covering the walls, pillars, and arches. There are also fine stained glass windows and elaborate carved stone details. It is one of the richest church interiors in Ireland and consistently surprises visitors who expect something more austere.

The cathedral is the seat of the Archbishop of Armagh, Primate of All Ireland — the most senior Catholic figure in Ireland — giving it significance well beyond its modest city. It is open to visitors daily; a modest donation is welcome.

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Construction began in 1840, was interrupted by the Great Famine in 1847 when the bishop redirected building funds to famine relief, then resumed and wasn't completed until 1904 — 64 years in total. When the interior was finally decorated in the mid-20th century, Irish craftsmen covered virtually every surface with mosaics, creating one of the most elaborate interiors in Ireland. The effect is stunning and unexpected behind the severe Gothic exterior.