Bridges Auditorium (referred to as "Big Bridges" to distinguish it from the smaller Bridges Hall of Music) is used for concerts and speakers and has a capacity of 2,500. Bridges Hall of Music ("Little Bridges"), to the east of the department of music, is a concert hall built in 1915 with seating for 600. On the western edge of campus is the Benton Museum of Art, which has a collection of approximately 15,000 works, including Italian Renaissance panel paintings, indigenous American art and artifacts, and American and European prints, drawings, and photographs. The Carnegie Building houses the Politics and Economics departments. It was built in 1929 as a library for the college. Marston Quadrangle serves as a central artery for South campus facilities, anchored by Carnegie on the west and Bridges Auditorium on the east. It is one of two quadrangles on campus.