One of the most famous natural marvels in the world, the Giant's Causeway is tucked away along the craggy coast of Northern Ireland. It is understandable why this UNESCO World Heritage Site draws tourists from all over the world with its remarkable hexagonal basalt columns and breathtaking coastline surroundings. A Belfast Tour Giants Causeway is a must-do for anybody starting a Belfast tour. The Giant's Causeway is more alluring and mysterious because of its rich mythology.