If you have not been to visit the ArchiTech Gallery in Chicago's gallery district, then what are you waiting for? The current exhibit is titled "Design 1890-1995" and features some rare and wonderful examples of design-related drawings, blueprints, sketches, and much more from luminaries like Frank Lloyd Wright, Keck & Keck, Bertrand Goldberg, and many more. Do yourself a favor and make plans to visit soon. More details here.
Image via ArchiTech Gallery website