Overview
Northburgh Castle gave Greencastle its name: a Norman sea-castle on a rock shelf above Lough Foyle, built to command the water rather than the land, and one of the most strategically sited medieval castles in Ireland. Round the bend on the approach road and it announces itself, weathered stone against the sky, the open lough on one side and the hills of Inishowen behind.
Today it is an open-air ruin. No ropes, no gates, no ticket booths, just wind through the stones and seabirds overhead. If you do one thing, stand in the lower courtyard by the gatehouse and look up; the scale of the original building only lands when you are inside it.
One caveat before you go: there is no car park at the castle and no facilities of any kind. Park in Greencastle village and walk in, wear sturdy shoes for the uneven medieval ground, and don’t count on it for pushchairs or wheelchairs.
History and architecture
Northburgh Castle was completed in 1305 by Richard Óg de Burgh, 2nd Earl of Ulster, the man Irish history remembers as the Red Earl. His close ties to Edward I of England show in the design: rather than the square-tower layout of earlier Irish and Norman castles, Northburgh has a gatehouse flanked by twin polygonal towers, borrowed straight from Edward’s great Welsh castles at Caernarfon and Harlech. The Ulster Journal of Archaeology once called it ‘the largest and most impressive building of its kind in Ireland’. The rock platform was too small for the full plan, so the gatehouse sits below the main castle, its gate passage opening only into a small lower courtyard with steps climbing to the main one above.
For two centuries the castle changed hands. It was a Norman administrative base, a target during Edward Bruce’s campaign of 1316, and later a seat of the O’Doherty chieftains after the de Burgh line faded, before the O’Donnells of Tyrconnell besieged and badly damaged it in the 1500s. Its darkest story comes from within the family: in 1332, Walter de Burgh was imprisoned in the castle dungeon and starved to death after a feud with his cousin the earl, an event remembered to this day in the skeleton on the coat of arms of Derry.
The site is managed by the Office of Public Works, and a local Northburgh Castle Conservation Group, formed in 2021, has secured Heritage Council and Community Monuments Fund backing to prepare a conservation plan for the ageing stonework.
Exploring the ruins
The main approach leads to the gatehouse, where the twin towers still rise several storeys. Inside, you can trace the foundations of the great hall and domestic quarters that once housed the garrison and officials.
Things to look for:
- The twin polygonal towers – The many-sided towers flanking the gatehouse came from Edward I’s Welsh castles; their rounded faces were far harder to undermine than a square corner, and they made the earl’s power unmistakable.
- The dungeon – Beneath the courtyard lies the cell where Walter de Burgh was starved to death in 1332. It is the most atmospheric corner of the site, and the source of that grim entry on Derry’s coat of arms.
- The curtain walls – Follow the surviving sections to see how the castle wrapped its natural rock foundation, which made a seaward assault almost impossible.
- Coastal views – Step out toward the shore path for a clear line across Lough Foyle; on a good day the Antrim hills of Northern Ireland are visible to the north.
A short walk away are the ruins of Temple Moyle, a small medieval church. Local tradition holds that an underground passage once linked the church to the castle, though no archaeology has ever confirmed it. The two together make a compact heritage walk.
Practical information
Opening hours and admission Northburgh Castle is free to visit year-round. In July and August the site is staffed from 10:00 to 18:00 with guided tours, closed on Mondays and Fridays. For the rest of the year it is open for self-guided visits.
Access and parking There is no dedicated car park at the castle. Park in Greencastle village and reach the ruin from the roadside or the shore path, a walk of a few minutes. The ground is uneven throughout, a mix of original stonework, gravel and grass, so wear sturdy footwear; the interior is not suitable for wheelchairs or pushchairs.
Best time to visit Early morning or late afternoon gives the softest light and the fewest people, and the low sun at either end of the day picks out the towers. Winter visits are quiet, but the wind off the lough is sharp, so bring layers.
Nearby Greencastle village has pubs and cafés and the Inishowen Maritime Museum, making it an easy base for a half-day. For more coast, the beach and lighthouse at Stroove sit just to the north-east, and Kinnagoe Bay is a short drive on around the Inishowen headland.
Getting there
Northburgh Castle is just outside Greencastle on the R241, roughly 12 miles north of Letterkenny. From the N13, follow signs for Moville and then Greencastle; the entrance is signposted on Stroove Road, about 200 metres from the village centre. There is no rail service and public transport is limited, so a car is the practical option. For the history rather than just the view, time your visit for a July or August guided tour, but not a Monday or Friday, when the site is closed.