Heddal stave church is a triple nave stave church and is Norway's largest stave church. It was constructed at the beginning of the 13th century. After the reformation, the church was in a very poor condition, and a restoration took place during 1849 - 1851. However, because the restorers lacked the necessary knowledge and skills, yet another restoration was necessary in the 1950s. The interior is marked by the period after the Lutheran Reformation in 1536-1537 and is for a great part a result of the restoration that took place in the 1950s. What is known is that five peasants together with Sira Eilif built the church.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.