basalt columns of the giant's causeway in county antrim, northern ireland

ancient antrim attraction basalt basaltic beach beautiful blue britain causeway closeup close-up coast coastal column columnar columns county eruption europe european fissure geology giant giant's giants great heritage hexagon hexagonal igneous interlocking ireland kingdom landscape magmatic natural nature north northern outdoor polygonal prism rock route scene scenery scenic seafront seascape seaside sightseeing site stone tourism travel unesco united volcanic volcano world