The Museum of Questionable Medical Devices is in a storefront
in a mall called "Riverwalk" or something similar, in Minneapolis-
St Paul.
 
I recommend it very highly.  In addition to the attraction
of all those weird devices, the proprietor is a fascinating
character himself, and a double for WC Fields.
 
--bayla (while you're in M'polis-StP, also stop at the Bakken
Library of Electricity in Life, which is in a lovely lakeside
mansion, and houses medical instruments as well as a unique
collection of books and ephemera.
 
Then stop off at the supermarket Byerly's which has an
*incredible* pastry department -- they give you a three-page
typed list of what's in what luscious goodie...