Waytemore Castle, The Causeway, Bishops Stortford, Hertfordshire
These are the remains of a late 11th century motte and bailey castle. It is north of the town on the east bank of the River Stort. It was founded in the reign of William I (1066-87). It was seized by a would be Bishop of London in 1137. The castle was an early stronghold of the Bishops of London and is of special interest in that it still has traces of the keep (defensive inner tower).