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50 most incredible rock formations in the world

Photos Logo Photos | Slide 1 of 50: CAPTION: Bushmills, Northern Ireland - June 17, 2017: the Giant's Causeway is an area of about 40,000 interlocking basalt columns, a result of an ancient volcanic eruption. It was declared a World Heritage Site by UNESCO in 1986.

Giant's Causeway, Northern Ireland

The Giant's Causeway is located in County Antrim on the north coast. It is made up of some 40,000 black basalt columns that are protruding from the sea. The eroded tops of the hexagonal columns make a natural walkway. Declared a World Heritage site by UNESCO in 1986, this is one of the most popular tourist attractions in the country. 

© Chiara Salvadori/Getty Images
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