The Auditorium Building in Chicago is a National Historic Landmark that houses the Auditorium Theatre, a world-class performance venue that hosts over 200 events annually. The building features ornate gilded and bas-relief designs, intricate mosaics, and 24-karat gold-leafed ceiling arches. The theatre is renowned for its unparalleled acoustics and was praised by Frank Lloyd Wright as "The greatest room for music and opera in the world-bar none."