The museum building is highly regarded by architects. The original building, designed by Paul Philippe Cret, is flanked by north and south wings with the white marble as the main exterior material for the entire structure. The campus is part of the city's Cultural Center Historic District listed in the National Register of Historic Places. The museum's first painting was donated in 1883 and its collection consists of over 65,000 works. With about 677,500 visitors annually for 2015, the DIA is among the most visited art museums in the world. The Detroit Institute of Arts hosts major art exhibitions; it contains a 1,150-seat theatre designed by architect C. Howard Crane, a 380-seat hall for recitals and lectures, an , and a conservation services laboratory.