In the 1880s Thomas M. Carnegie, brother of steel magnate Andrew Carnegie, and his wife Lucy bought land on Cumberland for a winter retreat. In 1884, they began building a mansion on the site of Dungeness, though Carnegie never lived to see its completion. Lucy and their nine children continued to live on the island, naming their mansion Dungeness after that of Greene. Dungeness was designed as a 59-room castle. They also built pools, a golf course, and 40 smaller buildings to house the 200 servants who worked at the mansion. The last time Dungeness was used was for the 1929 wedding of a Carnegie daughter. After the Crash and the Great Depression, the family left the island and kept the mansion vacant. It burned in a 1959 fire, believed to have been started by a poacher who had been shot in the leg by a caretaker weeks before. Today, the ruins of the mansion remain on the southern end of the island. The Carnegie family owned 90% of the island.