Helsinki, Finland
1748-1917
Turku, Finland
1280
Hämeenlinna, Finland
ca. 1250-1300
Savonlinna, Finland
1475-1483
Lappeenranta, Finland
1721-1792
Hamina, Finland
1720-1803
Raasepori, Finland
1360-1378
Sund, Finland
1388
Loviisa, Finland
1748-1770
Kotka, Finland
1790-1796
Loviisa, Finland
1748-1757
Pori, Finland
1930s
Savitaipale, Finland
1790-1793
Kotka, Finland
1791-1808
Luumäki, Finland
1773-1796
Kouvola, Finland
1791-1792
Kouvola, Finland
1791-1792
Saltvik, Finland
Viking age
Kustavi, Finland
1915
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.