The Citadel of Dinant (Citadelle de Dinant) was built in 1815 on a site which was originally fortified in 1051 when the region was ruled by the Prince-Bishopric of Liège. The citadel overlooks the city of Dinant and the strategic Meuse river which runs through the town. It is open to the public.
Together with Huy, Liège and Namur, the Citadel of Dinant forms part of the so-called Meuse Citadels.References:
Kristiansten Fortress was built to protect the city against attack from the east. Construction was finished in 1685. General Johan Caspar von Cicignon, who was chief inspector of kuks fortifications, was responsible for the new town plan of Trondheim after the great fire of 18 April 1681. He also made the plans for the construction of Kristiansten Fortress.
The fortress was built during the period from 1682 to 1684 and strengthened to a complete defence fortification in 1691 by building an advanced post Kristiandsands bastion in the east and in 1695 with the now vanished Møllenberg skanse by the river Nidelven. These fortifications were encircled by a continuous palisade and thereby connected to the fortified city. In 1750 the fortress was modernized with new bastions and casemates to protect against mortar artillery.