From Parisian bridges to Rome's Trevi Fountain, tourists love leaving behind mementos—but in Northern Ireland, they're eroding a 60-million-year-old landmark.

In 2024, the Giant’s Causeway, which is a UNESCO World Heritage Site, received more than 684,000 visitors, with many leaving coins in the gaps between its estimated 40,000 columns. According to ...

Last year, the Giant's Causeway received about 684,000 visits. The numbers are steadily climbing back to their pre-pandemic levels. There were nearly a million visits in 2019.

The Giant's Causeway in Northern Ireland is made up of 40,000 hexagonal stones. Jennifer Boyer via Flickr under CC BY 2.0 Last year, roughly 684,000 individuals visited the Giant’s Causeway.

In 2024, the Giant’s Causeway, which is a UNESCO World Heritage Site, received more than 684,000 visitors, with many leaving coins in the gaps between its estimated 40,000 columns.