<Li> <P> Choir of Chartres Cathedral with the new, stronger four - part rib vault </P> </Li> <P> Choir of Chartres Cathedral with the new, stronger four - part rib vault </P> <Li> <P> Bourges Cathedral with flying buttresses (1195 - 1230) </P> </Li> <P> Bourges Cathedral with flying buttresses (1195 - 1230) </P>

The floor plan of the gothic cathedral is based on what