The older church of Öckerö was built around 1450 to the site of earlier wooden church. The current appearance date from the restoration made in the 1780s. There are two artefacts, a font and crucifix, dating from the previous church and two wooden sculptures made in the 15th century. The altar was made in 1626 and roof paintings (“Last Judgement”) in 1792.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.