Castelnuovo Magra is mainly known for its ancient castle which was once the capital of the Bishop of Luni's domain. The castle had been originally built in the 12th century by Bishop Walter and then later completed by Henry of Fucecchio who developed the Code Pelavicino. Quite a lot of changes and additions have been made to the castle over the centuries. Today, visitors can see the remains of the large ancient walls, the masonry sections of the original castle and the large tower which had a rectangular plan.
References:The Gravensteen is a castle in Ghent originating from the Middle Ages. The name means 'castle of the counts' in Dutch. Arnulf I (918–965), Count of Flanders, was the first to fortify this place, building a medieval bastion on this high sand dune, naturally protected by the river Leie and its marshy banks. This bastion consisted of a central wooden building and several surrounding buildings, also in wood.
In the early 11th century, the wooden building was replaced by a stone residence, consisting of three large halls that made up three storeys, connected by a stone stairwell. The monumental stone staircase, the light openings, the fireplaces built into the walls and the latrines were signs of considerable luxury and comfort in those days. There was probably also a tower.