Rheinland-Pfalz, Germany
1728
Dörzbach, Germany
1615-1629
Oßmannstedt, Germany
1797
Eitorf-Merten, Germany
1791
Diez, Germany
1672-1681
Achstetten, Germany
1795-1797
Alberweiler, Germany
17th century
Hohenburg, Germany
1712-1718
Zülpich, 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.