The walled medieval town of Cabrejas del Pinar was the leader of its Community of Burgs and Land and there are some traces left of the walled enclosure and fortress that protected the locals. The castle was built in stone on top of a high rock possibly between the 13th and 14th century.
Some of the walls, doors and the keep are still visible which helps understand how the fortress’ layout once was. The quadrangular keep was built in stone masonry and reinforced with ashlar on the corners. On some of the higher floors, you can still see wood fixed in holes that supported the wooden floors on each of the four stories. The access door can still be seen and is located on the south-east wall defended by watchtowers and an opening.
On the eastern part of the walled enclosure, there is still a circular watchtower placed there possibly in the 10th century in order to have better visual control over the Caliphate’s territories.
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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.