Norwich Castle

Completed by 1121 Norwich Castle was designed to be a Royal Palace rather than a fortification. However, no Norman kings ever lived in it.
From the 14th century the keep was used as a county gaol, until a new gaol was constructed both inside and around the keep in 1792-93. This, however, was too small and became quickly outdated, so the outside block was demolished between 1822-27 and re-designed.
In 1883 the county gaol moved to Mousehold Heath in Norwich and work began on converting the building into a museum. In 1894 Norwich Castle opened as a museum.
In 2000-01, Norwich Castle was significantly refurbished, with substantial funding from the Heritage Lottery Fund.

Norfolk Museums & Archaeology Service - Norwich Castle
www.museums.norfolk.gov.uk/Visit_Us/Norwich_Castle/index.htm

For the avoidance of confusion that isn't a giant water cooler in front of the castle it's a lift!