The high vaults of Chartres close at about 36-37 m

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The main structure of the rebuilt cathedral is substantially complete within roughly a quarter century of the fire. The three-storey elevation drops the tribune gallery that earlier Gothic churches used to buttress the nave, and its place is taken by flying buttresses on the outside - which is exactly the trade this Journey is about: the support moves out of the building, and the wall it vacates becomes glass.

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