Quadrangle Construction, by Tinsley, Jeffrey Wayne 1947-2017, 1984, Smithsonian Archives - History Div, Looking down from the tallest tower of the Smithsonian Institution Building towards Independence Avenue, view is of the Quadrangle (South Yard) construction site for the future home of the Arthur M. Sackler Gallery, the National Museum of African Art and the S. Dillon Ripley International Center, an underground museum and research complex. The pit has been dug and the construction of the building is in its early stages. The South Tower of the Smithsonian Institution Building is in the foreground, and the Forrestal Building, headquarters facilities for the U.S. Department of Energy (DOE), is in the background..