The Charles Trumbull Hayden Library serves as the main library on the ASU Tempe campus. Located on Cady Mall, it houses books and other research materials in the humanities and social sciences, including business and education. The library also houses many special collections.
Built in 1966, Hayden Library is named for Charles Trumbull Hayden, founder of Tempe and first president of the board of the Arizona Territorial Normal School. The five story building was designed by the architectural firm of Weaver and Dover in the "Pavilion" style and featured a dry moat, which was intended as a sculture garden and quiet reading area.
In 1989, in what was to have been the first of a two-phase expansion, the library added two floors below Hayden Lawn and moved the main entrance of the library as part of this expansion. The design of the expansion included a grand stairway leading below grade to a large open-air gardened courtyard. Inside, the entry features a large seal of Arizona inlaid in the floor. Above the seal, on the Hayden Lawn sits the "beacon of knowledge," which is illuminated at night by the interior lights of the library below.