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One of the many sights along Norwich's Riverside Walk is the Cow Tower. This can be seen at a bend in the River Wensum near the Bishop Bridge. The Cow Tower was originally part of Norwich's medieval city wall and was first built in 1278 for defensive purposes. It was rebuilt in brick two centuries later. Access to the small tower is permitted and once inside you can see the remains of the old fireplaces. It is believed the tower gained its name when it was used as a shelter for cows.