Waldenburg castle lies at the summit of the spur that projects sharply from the crest of the mountain on the site of the original 13th century castle, commanding a superb panoramic view over a plain with a radius of almost 160 kilometers. It has been in the possession of the House of Hohenlohe without interruption since 1253. In the 16th and 17th centuries the castle was converted into a royal palace. The palace church, today the parish Church of St. Michael, was erected in 1791. The palace was gutted by fire in 1945. During reconstruction the architects were careful to preserve the outer structure, but much had to be altered inside. In the process, they rediscovered a 65-meter deep well that had been forgotten since the 15th century. Since 1971 the palace has housed the museum 'Siegel aus tausend Jahren' (Seals from a Thousand Years). Here you can enjoy examining approximately 800 seals from the collection of Friedrich Karl I, Prince zu Hohenlohe-Waldenburg (1814 – 1884), a Russian lieutenant general and founder of the academic study of seals. In the 'lower archives' can be found the small coin collection with coins and medallions of the House of Hohenlohe. Pewter figure dioramas with scenes from the life of important Hohenlohe lords with their seals and well-illustrated display panels augment the collections.
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.