25 Strangest Geological Formations On Earth

23
The Giant’s Causeway – Northern Ireland
Giant's_Causeway_(14)
The Giant’s Causeway is an area of about 40,000 interlocking basalt columns, the result of an ancient volcanic eruption. The tops of the columns form stepping stones that lead from the cliff foot and disappear under the sea. It was declared a World Heritage Site by UNESCO in 1986.
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