Giant's Causeway

Around 40,000 interlocking basalt columns, mostly hexagonal, stepping down into the sea on the north coast of Northern Ireland, created by volcanic activity 60 million years ago. Legend says it was built by the giant Finn McCool. It's a UNESCO World Heritage Site.

The stones themselves are free to visit by the coast path; the visitor experience (charged) includes parking and the exhibition. Walk the cliff-top path for a different view. Along the Causeway Coastal Route are the Carrick-a-Rede rope bridge and the ruins of Dunluce Castle.