Võisiku estate (Woiseck) was first mentioned in 1558. The current building was constructed in the second half of the 18th century. A veranda was added at a later date. Timotheus Eberhard von Bock (1787-1836), about whom Jaan Kross has written one of his most well-known novels, The Czar's Madman, lived at Võisiku manor. Chess player and endgame composer Friedrich Amelung was born at Võisiku Manor in 1842. Today it is open advance bookings only.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.