The Causeway
A lava flow cooled slowly and cracked into some forty thousand columns, most of them six-sided, stepping down into the sea. The geology was only accepted in the nineteenth century; the older explanation was that the giant Finn McCool built a road to Scotland, and that one is still told better.
The Giant's Causeway is Northern Ireland's only UNESCO World Heritage Site, on the Antrim coast. The columns are free to walk on.
In the guideCauseway Coast & Glens →