Clitheroe Castle in Lancashire, England, is all that remains of a former motte and bailey type castle. It was known as an enclosure castle, which meant the outer wall formed the most important part of its defenses. Unfortunately, most of the original curtain wall has been lost. The castle keep, the second smallest stone keep in England, is in very good condition for a 12th-century structure, but there was extensive restoration work in 1848. Most English motte and bailey castles were built on artificially created mounds, but at Cltheroe the…