Węgorzewo, Poland
1398
Dzialdowo, Poland
14th century
Olsztynek, Poland
1349-1366
Międzyrzecz, Poland
c. 1350
Ełk, Poland
1497/1888
Książ Wielki, Poland
1585-1595
Lebork, Poland
14th century
Niemodlin, Poland
13th century
Danków, Poland
15th century
Barciany, Poland
1377
Szczecinek, Poland
1310
Lesko, Poland
16th century
Grzegorzew, Poland
1425
Manasterzec, Poland
1340
Czluchow, Poland
c. 1365
Grodziec, Poland
15th century
Koźmin Wielkopolski, Poland
14th century
Gołańcz, Poland
14th century
Sieraków, Poland
14th century
Przecław, Poland
16th 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.