structural:summarization
Residences

Carnegie bought Skibo Castle in Scotland, and made his home partly there and partly in his New York mansion located at 2 East 91st Street at Fifth Avenue. The building was completed in late 1902, and he lived there until his death in 1919. His wife Louise continued to live there until her death in 1946. The building has been used since 1976 as the Cooper-Hewitt, Smithsonian Design Museum, part of the Smithsonian Institution. The surrounding neighborhood on Manhattan's Upper East Side has come to be called Carnegie Hill. The mansion was designated as a National Historic Landmark in 1966.