Potsdam, Germany
1787-1792
Lemgo, Germany
1325
Mönchengladbach, Germany
12th century
Memmelsdorf, Germany
1686
Düsseldorf, Germany
1748-1772
Rammenau, Germany
1721-1735
Güstrow, Germany
1558
Rastatt, Germany
1700-1707
Bayreuth, Germany
1753
Brühl, Germany
1729-1737
Ettlingen, Germany
18th century
Berlin, Germany
1664
Bad Urach, Germany
15th century
Pirna, Germany
1719-1723
Ludwigsburg, Germany
1714
Stuttgart, Germany
1822
Hachenburg, Germany
1715-1746
Leipzig, Germany
1756
Weimar, Germany
1724-1748
Wickrath, Germany
1746/1875
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.