For years, thousands of visitors left coins for luck in Giant’s Causeway’s ancient rocks. Years later, more than 10,000 have been removed

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For years, visitors to Northern Ireland’s Giant’s Causeway pushed coins into gaps between its famous basalt columns as a gesture of luck or affection. The tradition eventually left a mark on the ancient rock formations, prompting conservation teams to remove more than 20kg of coins, or roughly 10,000 pieces, in a painstaking operation.