September 5, 2014

Giant's Causeway, Ireland

Photograph by Jeff Mauritzen, National Geographic

Science and mythology mingle at the Giant's Causeway, formed from volcanic activity some 50 to 60 million years ago. One of the most popular sites in Northern Ireland—and the first World Heritage site on the Emerald Isle—the landscape of around 40,000 basalt columns is considered a geological wonder. The giant of folklore is epic hero Finn McCool, who's said to have built a causeway to Scotland to challenge the neighboring land's resident giant.

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