The Giant’s Causeway is a result of an ancient volcanic eruption that led to thousands of interlocking basalt columns. Today, in addition to being a UNESCO World Heritage site, it’s also one of the most visited tourist destinations in the U.K.

Although not in Belfast, it can be easily visited on a day trip from the city. Flanked by the North Atlantic Ocean on one side and dramatic cliffs on the other, the giant hexagonal columns make for a great sight. According to local legend, the basalt columns are the remains of a causeway built by a giant, hence the name. It’s close to the Irish town of Bushmills and a 3-kilometer walk from the visitor centre. Half-way through the walk, visitors are treated to an amazing view of the columns from a height. For those who hate walking, a bus ferries people from the visitor centre to the site of the columns. And for those who love walking, there are four stunning trails at Giant’s Causeway with difficulty levels ranging from casual strolls to tough hikes.

Another good news for nature lovers is the species of sea birds that are frequently sighted alongside rare and unusual plant species. Fulmar, Petrel, and Razorbill are some of the birds that are seen.

Giant’s causeway, when combined with some of the other beautiful sites in the area, is a perfect day trip from Belfast.