The Former Chicago Historical Society Building is a historic landmark located on the northwest corner of Dearborn and Ontario streets in downtown Chicago. Built in 1892, it is a prime example of Henry Ives Cobb's Romanesque Revival architecture, and the home of the Chicago Historical Society prior to relocating to Lincoln Park. This large granite-clad building is simply known as "Excalibur" or "Vision" by Chicago's populace, because it houses two popular nightclubs with those names. Henceforth, Excalibur will be used as a substitute title to the cumbersome name "Former Chicago Historical Society Building."
Excalibur and Vision Nightclubs 
Main article: Excalibur (nightclub)
Excalibur was a popular hangout for Dennis Rodman when he played professional basketball for the Chicago Bulls during the late 1990s. Vision is a large multi-level, multi-room nightclub that caters to anyone who likes hip-hop, trance, and or house music. Chicago attracts people from all over the nation to visit Vision, when internationally well-known DJs such as Armin van Buuren or James Holden play live sets at the venue.
- ^ "National Register Information System". National Register of Historic Places. National Park Service. 2006-03-15.
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