This keep was built in 1172 and was deigned by a French man called Maurice who also deigned the Ficket tower at Dover Castle. Clever design, as it was built to transport water from the well room to the lower dungeon! The well itself is 90 ft deep and contains about 45 ft of water. The keep measures about 75 x 78 feet and stands on a 9 course chamfered stone plinth to stop the enemy from tunnelling in ! Well worth a look ! Your ticket will also allow you into the Black Gate, built 1247 which also has a history of its own such a what it has been used for!