In fact, there are over 1400 ruins (of castles, abbeys, churches, ancient sites, houses, mills, etc.) spread around the country (including Northern Ireland).
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Giant's Causeway, County Antrim.Constantly ranked among Northern Ireland's top tourist attractions, the Giant's Causeway with it's 40,000-year-old volcanic basalt columns is a unique jewel in the crown of the Antrim coastline and a natural wonder – It's also known to the Irish as “the 8th Wonder of the World”.