Juergen:

While NOT a true woodworking site, you must stop at
Frank Lloyd Wright's Taliesin in Spring Green. Will be
about an hour or so drive from Madison. You will find
a LOT of crafted furniture built by Wright and his students
(mostly them) but you will be treated to a wonderful
tour. Take the one that goes into the house.

Taliesin will be open in April, here's a link:

http://www.taliesinpreservation.org/

MJ Wallace