DUBLIN, IRELAND—BBC News reports that archaeologists working at the site of the Hellfire Club, an eighteenth-century hunting lodge built with stones taken from nearby passage tombs, spotted a carving that may be 5,000 years old on a damaged stone that had long been part of a fire ring. The image is nearly invisible, but the changing fall sunlight hit the stone at an angle and revealed a long curving line cutting over two concentric circles. “This is a motif that appears in megalithic art at some of the most famous passage tombs in the country,” said archaeologist Neil Jackman of Abarta Heritage. The stone is being analyzed at Ireland’s National Museum, and could help researchers learn more about the destroyed passage tomb. To read about other discoveries in Ireland, go to “Treasures of Rathfarnham Castle.”