Shell keep
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A shell keep is a style of medieval fortification, best described as a stone structure circling the top of a motte.
An aerial view of Windsor Castle with its shell keep (called "The Round Tower") prominent on its motte inside the middle ward (middle bailey)
The shell keep of Windsor Castle was built by Henry II and remodelled in the 19th century.
Restormel Castle built around the motte
Tamworth Castle, Staffordshire
Motte-and-bailey castle
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A motte-and-bailey castle is a European fortification with a wooden or stone keep situated on a raised area of ground called a motte, accompanied by a walled courtyard, or bailey, surrounded by a prot
Plan of Topcliffe Castle in North Yorkshire, England, an archetypal motte-and-bailey design
Castle Pulverbatch in Shropshire, England, was built in the 11th or 12th century and abandoned by 1202. This digital elevation model shows the motte just left of centre, with the bailey to the right (north-east) of it.
The motte and bailey defences of Launceston Castle in Cornwall, England
A lidar view of Topcliffe Castle and Cock Lodge in North Yorkshire