Giant's Causeway

Website includes details of three Trails: [1] The Blue Trail - - - : [2] The Red Trail - - - : [3] The Runkerry Trail: 'The Giant's Causeway is an area of about 40,000 interlocking basalt columns, the result of an ancient volcanic eruption ... It was declared a World Heritage Site by UNESCO in 1986, and a national nature reserve in 1987 by the Department of the Environment for Northern Ireland. In a 2005 poll of [BBC] Radio Times readers, the Giant's Causeway was named as the fourth greatest natural wonder in the United Kingdom'.

National Trust