evidence: Up the Antrim Coast [...] The other main attraction along the Antrim Coast is Giant’s Causeway, a UNESCO World Heritage site, known for its 40,000 volcanic basalt columns, many hexagonal in shape, that cover a large area and form stepping stones from the base of cliffs down to the sea. It is quite a sight to see. There is again, a decent walk from the visitors’ center to the actual columns, although a shuttle bus is available for those who aren’t able to walk.