Carlisle Castle is an impressive Norman stone keep and bailey, although much altered with its continuous military use. The two walled baileys are side by side, with the outer bailey curtain wall flanked by a 12th century gatehouse with a L-shaped barbican and two small towers. In the outer bailey are 19th century barracks and a parade ground which has been raised, giving the half-moon battery guarding the inner gatehouse an odd look. In the inner bailey is a massive 12th century three storey keep, originally entered from a forebuilding and also the remains of an Elizabethan range, with an octagonal stair turret. 6 miles east is Corby Castle.