Flying Buttresses. They look lovely, but actually play a large role in keeping the structure steady.
Clerestory, flying buttress, Chartres Cathedral- Chartres, Eure-et-Loire, France
beautiful flying buttresses at Notre Dame in Paris
DIAGRAM: illustrating "flying buttresses". The flying buttresses on Chartres are rather modest compared to later cathedrals.
Flying Buttresses - suitable for tracing Openings/construction techniques
Flying buttress supports typical of Gothic architecture | Washington National Cathedral...
Gothic architecture | The Bach Walter Scott Monument, Edinburgh
Flying Buttresses at Chartres Cathedral in France. I have already been here but it is LOVELY and I want to go back. I love France