Bonn, Germany
1858-1860
Rödental, Germany
1808-1817
Lohmar-Wahlscheid, Germany
1763
Kandern, Germany
1762
Hamburg, Germany
1831
Ludwigsburg, Germany
1717-1723
Amberg, Germany
1417
Klutz, Germany
1726-1732
Pommersfelden, Germany
1711-1719
Schönfeld, Germany
1560-1580
Eckersdorf, Germany
1761
Tettnang, Germany
1712-1770
Wannsee, Germany
1682
Hasselburg, Germany
18th century
Ellingen, Germany
1708-1720
Potsdam, Germany
1858-1861
Werneck, Germany
1733-1745
Nassau, Germany
1621
Zweibrücken, Germany
1720-1725
Velen, 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.