Giant's Causeway is a cluster of approximately 40,000 basalt columns rising out of the sea on the Antrim Coast of Northern Ireland. These rock formations get their name from an old legend stating that Irish warrior Finn McCool built the path across the sea to face his Scottish rival, Benandonner.
On his way back to Scotland, Benandonner tears up the path behind him, leaving just what exists today on the Northern Irish coast and the Scottish island of Staffa, which has similar rock formations.
While the legend makes for an interesting story, geologists have a different explanation for the creation of the Giant's Causeway: volcanic activity. Now declared a UNESCO World Heritage Site, thousands of tourists visit Giant's Causeway each year to marvel at and photograph this natural wonder.