The keep at Tattershall is the only substantial remains. The keep was one of the first made from Flemish brick, the new fashion for the time and is rectangular in shape with octagonal towers at the four corners. It was not designed to be self-contained as other keeps were, but was originally attached to other smaller buildings that would have contained kitchens and other services. The walls are so thick, that there are passages and small rooms built into them.
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