As far as medieval, Gothic cathedrals are concerned, the one at Bourges (St-Etienne) is definitely one of the best, and located as it is in the very pretty town of Bourges, makes a trip there worthwhile, but how many cathedrals should be on the List is a different story...not that many more, I would say. Since Bourges was an important stopover point on the way to Santiago, the cathedral is additionally inscribed on the WH List as part of the "Routes of Santiago de Compostela in France" and gives you two WH sites for a single visit...not too bad, either.