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In page Cologne Cathedral:

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The ground plan design of Cologne Cathedral was based closely on that of Amiens Cathedral, as is the style and the width to height proportion of the central nave. The plan is in the shape of a Latin Cross, as is usual with Gothic cathedrals. It has two aisles on either side, which help support one of the very highest Gothic vaults in the world, being nearly as tall as that of the Beauvais Cathedral, much of which was never built or had collapsed. Externally the outward thrust of the vault is taken by flying buttresses in the French manner. The eastern end has a single ambulatory, the second aisle resolving into a chevet of seven radiating chapels.[citation needed]