Some informations for visitors: Chartres
Chartres is not far from Paris, you can get there easily by
train
leaving from Gare Montparnasse it takes less than one hour
This
site
is in french, it gives you a very nice idea of what to find there and also
the openings hours and visits schedules
This
site
is in english with nice pictures
This
site does not have
yet versions in english, german, spanish, and italian...
I like this (one page with pictures)
site
and also
this one