#7: Giant’s Causeway (Northern Ireland)
Ancient legend said an Irish giant built this path to cross the sea and fight a Scottish rival. The scientific reason is just as dramatic: an ancient volcanic eruption formed these 40,000 interlocking basalt columns. The geometric shapes are so perfect they look man-made, fitting together like a massive stone puzzle. You can walk along the columns as they step down into the Atlantic Ocean. It was declared a UNESCO World Heritage Site in 1986, a place where geologic history feels like old-world mythology.
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