Carnegie Museums of Pittsburgh are four museums that are operated by the Carnegie Institute headquartered in the Carnegie Institute complex in the Oakland neighborhood of Pittsburgh, Pennsylvania, United States. The Carnegie Institute complex, which includes the original museum, recital hall, and library, was added to the National Register of Historic Places on March 30, 1979. Two of the Carnegie museums, the Carnegie Museum of Natural History and the Carnegie Museum of Art, are both located in the Carnegie Institute and Library complex in Oakland, a landmark building listed on the National Register of Historic Places (ref #79002158, added 1979). It also houses the Carnegie Music Hall and the main branch of the Carnegie Library of Pittsburgh. Andrew Carnegie donated the library and the buildings. With the goal of inspiring people to do good for themselves and their communities, the terms for donations required communities to support them in exchange for the building and initial investment by Carnegie. The words "free to the people" inscribed above the entrance of the Carnegie Library of Pittsburgh illustrate his vision. The other two museums, The Andy Warhol Museum and the Carnegie Science Center, are located in separate facilities on Pittsburgh's North Shore. The Andy Warhol Museum Opened on May 15, 1994, the Andy Warhol Museum is the first museum to exclusively focus on an American postwar artist. The building which houses the Andy Warhol Museum was originally built in 1911 for industrial purposes, but was redesigned for the museum by architect Richard Gluckman. The museum currently has seven floors of gallery and exhibition space as well as an underground education studio and conservation lab. Warhol's primary artistic technique was silkscreen pop art, which he gained notoriety for in the early 1960s. The serial images derived from the culture's consumerism and conception of beauty are reified in a form of art which represent the identity of constituents in postwar American society.