Cincinnati City Hall is a registered historic building in Cincinnati, Ohio, listed in the National Register on December 11, 1972. The main building comprises four and a half stories with a nine story clock tower. An optical trick known as forced perspective makes the building appear even larger than it actually is. As it becomes taller, its windows get smaller. The building was constructed by the David Hummel company of Cincinnati using stone quarried in Wisconsin, Ohio, Missouri, and Indiana.