Aurignac, France
13th century
Saint-Avit-Frandat, France
15th century
Gabriac, France
11th century
Gorges du Tarn Causses, France
13th century
Montdardier, France
12th century
Valros, France
1199
Bramevaque, France
12th century
Opoul-Perillos, France
1246
Pieusse, France
1140-1145
Puissalicon, France
11th century
Meyrueis, France
14th century
Brax, France
13th century
Camjac, France
1180
Saint-Beauzély, France
12th century
Vézins-de-Lévézou, France
1120
Saint-Rome-de-Cernon, France
14th century
Fressac, France
13th century
Les Angles, France
13th century
Tramezaïgues, France
12th century
Terraube, France
c. 1272
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.