Building a round keep required a great deal of skill. The extra effort and expense might be well worth while however if the castle was build on a surface which might be undermined. A round tower is much more difficult to collapse than a square one.

The picture shows one of the best round keeps in Britain, at Pembroke. It is a huge building, 80 feet high. This is the only round tower in Britain to keep its original roof.

Pembroke Castle, Dyfed

Other examples :
Barnard Castle, Conisborough

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