Marstal Church was built in 1738 and extended in 1772. Seven votive ships indicate the growth of shipping in the town from the 18th to the 20th century. The font dates from the Middle Ages. Carl Rasmussen, a maritime artist who usually specialized in the motifs of Greenland, painted the 1881 altarpiece, depicting Christ stilling a storm. In the old churchyard are memorials and tombstones honoring the sailors of Marstal who died at sea during two world wars.
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.