Birnie Kirk was built c. 1140 and became the first cathedral of the Bishop of Moray. It remained the cathedral church until 1184 when Bishop Simon de Tosny died. His successor Richard de Lincoln moved the seat to the church of Kinnedar. The church is one of the oldest in Scotland to have been in continuous use.
The nave was shortened by a few feet in 1734 but the remainder is the original 12th-century structure. The building is constructed of finely cut ashlar blocks. It is simply designed with a nave and a smaller chancel. The nave and chancel are partitioned by a striking Romanesque arch. A baptismal font, contemporary with the building, sits in the corner of the nave.
In the grounds stands a Class I Pictish symbol stone, attesting to the area's long history. The circular nature of the grave yard suggests that the church overlies an earlier, Dark Age site.
There is a legend that in November 1704 Sir Robert Gordon, known as the 'Wizard of Gordonstoun', was pursued by the Devil as he rode towards Birnie Kirk. In the chase, Sir Robert was thrown over the churchyard wall, breaking his neck. Since he died on consecrated ground, the Devil could not claim his soul.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.