Potsdam, Germany
1763-1769
Hanover, Germany
1913
Meersburg, Germany
Schwerin, Germany
1845-1857
Stralsund, Germany
1278
Potsdam, Germany
1771-1775
Augsburg, Germany
1615
Karlsruhe, Germany
1715
Bonn, Germany
1697-1705
Munich, Germany
1617-1704
Augustusburg, Germany
1568-1572
Königswinter, Germany
1882-1884
Bensberg, Germany
1711
Münster, Germany
1767-1787
Bruchsal, Germany
1720
Leipzig, Germany
1899
Chiemsee, Germany
1878-1886
Berlin, Germany
1786
Potsdam, Germany
1851-1864
Chemnitz, Germany
15th century
Bomarsund fortress and garrison was built in 1832-1854 by Russian Empire to defence Åland Islands against enemies. British and French fleet attacked against it during the Crimean War in 1854. After a week of fighting the British stormed the remaining fort. Anglo-French forces destroyed it totally after battle. In the Treaty of Paris 1856, the entire Åland Islands were demilitarized, which is a status that has been preserved until this day.
Nowadays there are some ruins left and fortress area is open for visitors.