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Giant's Causeway and Causeway Coast

The Giant's Causeway lies at the foot of the basalt cliffs along the sea coast on the edge of the Antrim plateau in Northern Ireland. It is made up of some 40,000 massive black basalt columns sticking out of the sea. The dramatic sight has inspired legends of giants striding over the sea to Scotland. Geological studies of these formations over the last 300 years have greatly contributed to the development of the earth sciences, and show that this striking landscape was caused by volcanic activity during the Tertiary, some 50–60 million years ago.

http://whc.unesco.org/en/list/369

The Giant's Causeway is an area of 40,000 interlocking basalt columns resulting from a volcanic eruption. It is located about 2 miles (3 km) north of the town of Bushmills in County Antrim, Northern Ireland along the northeast coast of Ireland. 

The tops of the columns form stepping stones that lead from the cliff foot and disappear under the sea. Most of the columns are hexagonal, however there are some with four, five, seven and eight sides. The tallest are about 12 metres (36 ft) high, and the solidified lava in the cliffs is 28 metres thick in places. 

http://www.worldheritagesite.org/sites/giantscauseway.html