The first stone church on the Lendum site was presumably a Romanesque building built around 1200. In the end of the 16th century, it was so dilapidated that a complete reconstruction was needed. The church was restored as the current red brick building which is whitewashed except the eastern end and the southern wall. The pulpit is from 1640 and the altarpiece from 1722. The beautiful altar rails are made in wrought iron and the Roman baptismal font is in granite.
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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.