Wow, the St. Gallen cathedral is stunning and luminous, what a beauty...
Francois,Even more impressive is the Abbey Library. Do a Google Image search with "library St Gallen" as keywords.http://en.wikipedia.org/wiki/Abbey_library_of_Saint_Gall
The Library is famous. A long time ago, while in the army, I spent ten days in the St. Gallen's region. We had to stay outside St. Gallen and never got "free" time for a little touristic visit.
Francois,My bad. I forgot you are Swiss. :-)