Cooper Hewitt, Smithsonian Design Museum is a design museum housed in the Andrew Carnegie Mansion on Manhattan's Upper East Side. It originated in 1897 when Sarah, Eleanor, and Amy Hewitt — granddaughters of industrialist Peter Cooper — founded a museum for the arts of decoration at Cooper Union; the collection joined the Smithsonian Institution in 1968 and moved into the Carnegie Mansion, a 64-room house built 1899–1902, in 1970. Long known as Cooper-Hewitt, National Design Museum, it is the only U.S. museum devoted exclusively to historical and contemporary design, holding roughly 200,000 objects and drawing about 150,000 visitors a year through exhibitions and design education programs, including the National Design Awards.