Mahee Castle, Medieval tower house on Mahee Island, Northern Ireland.

Mahee Castle is a medieval defensive structure on an island in Northern Ireland, with two ground rooms connected by internal passages. The rooms feature vaulted ceilings and the walls display old defensive techniques for protection.

Captain Thomas Browne, an English soldier, built the structure in 1570 after receiving permission from a bishop. The location was strategically important for controlling this island region.

The castle marks an old boundary between two clan territories, showing how families once protected their lands in this region. The walls stand today as a sign of the medieval power relations between neighbors.

The structure is freely accessible and sits on an island that you reach on foot via a causeway. Parking is available at the nearby monastic site.

Archaeological digging found animal remains and items showing that people lived here much earlier. These findings are older than the building itself was constructed.

• Inception: 1570
• GPS coordinates: 54.50095,-5.64848
• Latest update: December 9, 2025 12:21