How Gothic architecture was structured. Important: The location and use of flying buttresses and ribbed vaulting.
Clerestory, flying buttress, Chartres Cathedral- Chartres, Eure-et-Loire, France
Flying Buttresses. They look lovely, but actually play a large role in keeping the structure steady.
DIAGRAM: illustrating "flying buttresses". The flying buttresses on Chartres are rather modest compared to later cathedrals.
Flying buttress typical of Gothic architecture | Washington National Cathedral...
Beautiful flying buttresses at Notre Dame in Paris
All sizes | Reims Cathedral. Flying Buttresses, via Flickr.