10 of the world's most amazing rock formations

7. Giant’s Causeway, Northern Ireland

Giant's Causeway, Northern Ireland
Giant's Causeway, Northern Ireland
Declared a UNESCO World Heritage Site in 1986, it’s hard to believe the Giant’s Causeway was not wrought by human hands. A coastal concourse made up of 40,000 smooth-sided, hexagonal basalt columns, the causeway looks too choreographed for Mother Nature, but was the work of an eruption back when Antrim was a hotbed of volcanic activity. We prefer the popular legend that it was built by mythic Gaelic giant Finn MacCool.
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