Dunluce Castle is one of the most extensive ruins of a medieval castle in Northern Ireland. It is located on the edge of a basalt outcropping in County Antrim, Northern Ireland and is accessible via a bridge connecting it to the mainland. It is between Portballintrae and Portrush. The castle is dramatically surrounded by terrifyingly steep drops either side, which would have been a very important factor to the early Christians and Vikings who were drawn to this place where an early Irish fort once stood.