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Lincoln Castle is a major Norman castle in Lincoln, England. It was constructed during the late 11th century on the site of a pre-existing Roman fortress. The castle is unusual in that it has two mottes. It is only one of two such castles in the country; the other is at Lewes in Sussex. Lincoln Castle remained in use as a prison and law court into modern times, and is one of the better preserved castles in England; the Crown Courts continue to this day. It is open to the public most days of the week, and possible to walk around the walls from which there are views of the castle complex, cathedral, the city, and surrounding countryside.