The Giants Causeway is the jewel in the crown of the scenic Antrim coastline. Come visit what the Irish call the 8th wonder of the world with us on The Original Belfast Giants Causeway tour. A UNESCO World Heritage-listed site, Giant’s Causeway is renowned for its beauty. Created 6 million years ago by a flow of basaltic lava, the Causeway is about 40,000 interlocking basalt columns. There is no other place like this on earth. the Antrim coast will be our first stop on this tour.