Poskær Stenhus is Denmark's largest round barrow, dating from the age of Funnelbeaker culture (around 3300 BC). The best view of this monument is from the north approach by the road through the hills of Mols Bjerge. The burial chamber has a diameter of more than 2 metres and a ceiling height of almost 1.8 metres. The chamber is surrounded by 23 kerb stones, some of which are more than 2.5 metres high. In 1859, the owner, Ole Hansen, started blasting the barrow stones to sell them as building material. He needed the money for his family and couldn't turn a proper living from the land where the barrow was. The barrow was rescued by local officials.
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.