The Smithsonian American Art Museum holds one of the world's most extensive and inclusive collections of American art, from the colonial period to the present. Its holdings chart the history of artistic production in the United States, with particular depth in 19th- and 20th-century painting, sculpture, folk art, and graphic arts. The museum shares its building with the National Portrait Gallery in the Old Patent Office Building, a National Historic Landmark renowned for its Greek Revival architecture. Its collection of contemporary craft and decorative art objects is also a highlight.