When you first see it you'll understand why the ancients believed the causeway was not a natural feature. The vast expanse of regular, closely packed, hexagonal stone columns dipping gently beneath the waves looks for all the world like the handiwork of giants.
This spectacular rock formation – a national nature reserve and Northern Ireland's only Unesco World Heritage Site – is one of Ireland's most impressive and atmospheric landscape features, but it is all too often swamped by visitors – around 750,000 each year. If you can, try to visit midweek or out of season to experience it at its most evocative. Sunset in spring and autumn is the best time for photographs.
Visiting the Giant's Causeway itself is free of charge but you pay to use the car park and the impressive new Giant's Causeway Visitor Experience. (Admission fee reduced by £1.50 if you arrive by bus, bike or on foot.) This ecofriendly visitor centre, built into the hillside and walled in tall black basalt slabs that mimic the basalt columns of the Causeway, houses an exhibition explaining the geology of the region, as well as a tourist information desk, restaurant and shop.
From the visitor centre it's an easy 1km walk from the car park down to the Causeway; minibuses with wheelchair access ply the route every 15 minutes (adult/child £2/1 return). Guided tours of the site (June to August only) cost £3.50/2.25 per adult/child.