Ireland, North, County Antrim, Giants Causeway The Organ in the cliffs composed of interlocking basalt columns the result of an ancient volcanic eruption on the northeast coast.

Interlocking basalt stone columns left by volcanic eruptions. View across the main and most visited section of the causeway with the coastline seen behind.

Interlocking basalt stone columns left by volcanic eruptions. View across the main and most visited section of the causeway with the coastline seen behind.

Interlocking basalt stone columns left by volcanic eruptions. View across the main and most visited section of the causeway

Interlocking basalt stone columns left by volcanic eruptions. View across the stones towards the east from the main section with cliffs and coastline