The 40,000 black basalt columns that arise from sea at the Giant's Causeway once inspired images of, you guessed it, giants stepping over the water from #Ireland to #Scotland. These amazing formations were created by volcanic activity some 60 million years ago. Bonus: the Bushmills distillery is nearby. World Heritage site since 1986. | 📷:GettyImagesCreative | #TravelTuesday [4 of 5] _ Celebrate #WorldHeritageDay by learning more about the international sites and monuments recognized by UNESCO around the world.