Grand-Hornu is an old industrial mining complex in Hornu in the municipality of Boussu. It was built by Henri De Gorge between 1810 and 1830. It is a unique example of functional town-planning. Today it is owned by the province of Hainaut, which houses temporary exhibitions in the buildings. As one of four Major Mining Sites of Wallonia, UNESCO designated it a World Heritage Site in 2012
References:Château de Niort is a medieval castle in the French town of Niort. It consists of two square towers, linked by a 15th-century building and dominates the Sèvre Niortaise valley.
The two donjons are the only remaining part of the castle. The castle was started by Henry II Plantagenet in the 12th century and completed by Richard the Lionheart. It was defended by a rectangular curtain wall and was damaged during the Wars of Religion. In the 18th century, the castle served as a prison.
The present keeps were the central point of a massive fortress. The southern keep is 28m tall, reinforced with turrets. The northern tower is slightly shorter at 23m. Both are flanked with circular turrets at the corners as well as semicircular buttresses. Each of the towers has a spiral staircase serving the upper floors. The Romanesque architecture is of a high quality with the dressed stones closely jointed.