United States War Department Special Services Photo: Image number 9 from Northern Ireland included in the 'Pocket Guide to Northern Ireland'. The caption reads: The Giant's Causeway on the north coast is one of the natural wonders of the world. It looks like the ruins of an enormous road that might have once joined Ireland and Scotland. Actually, it is ancient lava flow which broke up into thousands of basaltic columns - mostly six-sided. Copyright: U.S. War Department, 1942.