One of the most famous of the UNESCO World Heritage Sites. Giant's Causeway is an area of about 40,000 interlocking basalt columns, the result of an ancient volcanic fissure eruption. A great site to visit but incredibly busy.
Dunluce Castle is a now-ruined medieval castle in Northern Ireland, the seat of Clan McDonnell. It is located on the edge of a basalt outcropping in County Antrim (between Portballintrae …