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.

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.