The north coastline in renowned for it scenic beauty and the Giant's Causeway is its unique jewel in the crown, known to the Irish as the 8th Wonder of the World. A jagged promontory of neatly packed columns of hexagonal basalt rocks created some 6 million years ago by a flow of basaltic lava. As the lava cooled it formed these distinctive hexagonal shapes just as the bottom of a dried riverbed would crack into shapes.
It is easy to see how these almost perfectly symmetrical formations would be viewed as otherworldly by our earlier ancestors and how the Giant's Causeway would give rise to colourful legend.
The story goes that mythical Irish giant Finn MacCool built the causeway to get to Scotland and battle with a rival giant called Benandonner. When he got there he found that the Scottish giant was asleep but also far bigger than himself, so Finn returned back across the causeway. When Benandonner woke up he came across the causeway intent on fighting Finn. Finn's wife dressed up her husband as a baby and when Benandonner arrived she said Finn wasn't home and to be quiet not to wake up the baby. When Benandonner saw the baby he decided that if the baby was that big, Finn must be massive. So he turned tail and fled back across the causeway ripping it up as he went. All that remains are the ends, here at the Giant's Causeway and on the island of Staffa in Scotland where similar formations are found. ( as per "my guide Ireland" )