Dunluce Castle perches on a dramatic basalt outcrop above the North Antrim coast, connected to the mainland by a small bridge and separated from the sea cliffs on both sides. The ruins are extensive — the medieval castle was occupied by the MacDonnell clan and was the seat of the Earls of Antrim for centuries — and the coastal setting is extraordinary, with views along the Causeway Coast in both directions.
The site includes ruins of a town that grew up inside the outer walls, and a museum covering the history of the castle and the MacDonnell family. Some scenes from Game of Thrones were filmed here. Entry is charged; the castle is about five minutes' drive west of Bushmills. The approach along the coast road is one of the best drives in Northern Ireland.