Giant's Causeway, Ireland

The Giant's Causeway is a grouping of about 40,000 interlocked basalt columns, fused together during a volcanic eruption in ancient times. This World Heritage Site is located about two miles north of the town of Bushmills, on the beautiful Irish coastline.

There are many tall yarns in Irish folklore about how the Giant's Causeway was formed, and most of them involve warring giants, which seem to be a common thing in their "historic tales" ... I'll let you dig through those on the wikipedia page concerning the legends of the Giant's Causeway.