Visitors to the coast of Northern Ireland have always marveled at the so-called Giant’s Causeway — a field of some 40,000 interlocking basalt columns arranged in a tidy hexagonal pattern. German ...

Northern Ireland is home to the Giant’s Causeway, a collection of about 40,000 hexagonal basalt columns that protrude from the North Atlantic Ocean and lead up to the foot of a cliff. The UNESCO World ...