The Architecture Archives' collections date from the mid-nineteenth century to the present and document a diverse cross-section of the region's built environment. Collections represent, for example, the high-style architecture of Beaux Arts Classicism and Modernism; the progressive architecture of creative individualists; and the architectural vernacular of developer housing, "Main Street" commercial buildings, and roadside architecture. Some records document the region's special industrial heritage -- its steel mills and factories, and its transportation infrastructure -- its inclines and bridges. Other records represent Pittsburgh's architectural and building organizations. Carnegie Mellon's own architectural heritage is well represented, along with a sampling of the student and professional work of university alumni and faculty.