Cave di Cusa was an ancient stone quarry in Sicily. This site was quarried beginning in the first half of the 6th century BC and its stone was used to construct the temples in the ancient Greek city Selinunte. It was abandoned in 409 BC when the city was captured by the Carthaginians. It is now an official Sicilian Archeological Zone and a popular tourist site.
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.