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Drum towers, in European terminology, refer to the shape of the round towers often used to corner exterior walls, or to bolster outer defensive walls as they are at Conwy Castle in Wales.
References
Drum tower (Europe) Wikipedia(Text) CC BY-SA
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Drum towers, in European terminology, refer to the shape of the round towers often used to corner exterior walls, or to bolster outer defensive walls as they are at Conwy Castle in Wales.