Hrubý Rohozec is a castle in Turnov. The original structure was connected to a polygonal tower by a defensive wall. Its purpose, in the 14th century, was to monitor the trade route running below it. Between the two parts of the castle Jan von Šelmberk, and later Konrad Kraiger Kraigk, built Gothic palaces. During the Renaissance the Wartenberg family rebuilt the complex in the style of a chateaux.
Albrecht von Wallenstein bought it in 1621 followed by the noble family Desfours, who held it until 1945. After 1822 the castle was upgraded on the basis of plans by the architect Jan F. Joendl. The castle's library, dining room, bedroom and a blue room are open to the public and display their original furnishings.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.