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1527-1535
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Tarnobrzeg, Poland
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Bierzgłowski, Poland
1270-1305
Siewierz, Poland
13th century
Bolków, Poland
13th century
piotrkowski, Poland
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Golczewo, Poland
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Jawor, Poland
1663-1665
Bierutów, Poland
1534-1540
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.