Dome

View depicting relationship of roof truss to structure; Widely regarded as one of the most architecturally significant buildings of the 20th Century, Crown Hall was completed in 1956 during Mies' tenure as director of IIT's Department of Architecture. Crown Hall incorporates a clear span of 220 by 120 feet accomplished by steel plate girders situated above the roof. The building is famous for its clear structural expression, the varying qualities of transparency in its ultra-thin steel and glass facade, and the open, free flowing interior of the "universal space." S.R. Crown Hall was named a National Historic Landmark in 2001. Source: Wikipedia; http://en.wikipedia.org/wiki/Main_Page (accessed 11/4/2007)