The Giant's Causeway is a UNESCO World Heritage Site located in County Antrim, Northern Ireland. It is a unique geological formation of about 40,000 interlocking basalt columns, which formed after a volcanic eruption millions of years ago. The Giant's Causeway is a popular tourist destination, offering stunning coastal views and opportunities for hiking, walking, and exploring the unique rock formations. Visitors can climb the columns, take in the breathtaking scenery, and learn about the geological history of the area.