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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)

Declared a World Heritage Site by UNESCO in 1986, this is one of the most popular tourist attractions in the country. The Giant's Causeway is located in County Antrim on the north coast, three miles (4.8 km) northeast of the town of Bushmills. The eroded tops of the hexagonal columns make a natural walkway, with the tallest of them being 12 meters (39 ft) high.

© Chiara Salvadori/Getty Images
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