Château de Beaumont-sur-Oise

Of the feudal castle of Beaumont, one of the most important in the Oise valley, only the curtain walls, probably originally fronted by a ditch, and the keep survive.

The outside of the curtain wall is characteristic of defensive architecture: the outer facing is doubled in depth to increase its strength. The inner side, not exposed to danger, is built of smaller, less carefully dressed stone blocks.

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