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Architecture:
Anyone interested in checking out: http://www.taliesinpreservation.org/index.htm ? Its outside of Madison so we'd have to do it on free time (possibly Wed. afternoon?) and rent a car. Post in the comments if you're interested. There are also two FLW buildings in Madison itself.
Sightseeing:
Trek Bicycle's http://www.trekbikes.com/us/en headquarters is in Waterloo (~30min from Madison). They do free factory tours (60-90 min) Wednesdays & Fridays at 10AM.