Tallinn, Estonia
1319
Tallinn, Estonia
c. 1246
Tallinn, Estonia
1894-1900
Tallinn, Estonia
1845
Tallinn, Estonia
1229
Tallinn, Estonia
1230-1270
Tallinn, Estonia
1733
Tallinn, Estonia
1246
Tallinn, Estonia
1267
Tallinn, Estonia
1820-1827
Tartu, Estonia
1783
Tartu, Estonia
1250-1300
Tartu, Estonia
1300-1330
Tallinn, Estonia
1862-1882
Pärnu, Estonia
1744-1747
Haapsalu, Estonia
1852
Pärnu, Estonia
1768
Tallinn, Estonia
1752-1755
Viljandi, Estonia
15th century
Rakvere, Estonia
1430's
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.