Restormel Castle, Lostwithiel, Cornwall
Built on a spur overlooking the River Fowey with an unusual circular keep circa 1100, Restormel Castle is one of the oldest and best preserved Norman motte and bailey castles in Cornwall. Heavily defended by a 17 metre moat and artificially steepened foundation, the castle was rebuilt in the 13th century by Edmund, Earl of Cornwall, for use as a residence. The castle's condition is partly a result of its use a garrison in the Civil War. This site is now in the care of English Heritage (2010).