Where one can admire the Giant's Causeway? (a UNESCO World Heritage Site)
The Giant's Causeway is an area of about 40,000 interlocking basalt columns, the result of an ancient volcanic fissure eruption. Most of the columns are hexagonal, although there are also some with four, five, seven or eight sides. It is one of the most popular tourist attractions in Northern Ireland.
Answers by country
the United Kingdom
On which island on Lough Derg Lake is the "Purgatory of Saint Patrick" located?
The Holy Island