I'm in Northern Ireland, at a place called the Giant's Causeway. There are about 40,000 of these columns made of a really hard rock called Basalt, all fitting together like an enormous puzzle.

The National Trust is a conservation charity showcasing the beauty and history of Northern Ireland ... formation of around 40,000 interlocking basalt columns created by volcanic activity millions ...

The Giant's Causeway lies at the foot of the basalt cliffs along the sea coast on the edge of the Antrim plateau in Northern Ireland. It is made up of some 40,000 massive black basalt columns sticking ...

To the west, rise the hills of Donegal in the Republic of ­Ireland; to the north east ... Arch of White Rocks Beach and the striking basalt ­columns of Giant’s Causeway. Then there’s ...