Château de Lavardens dominates the skyline of surrounding lands. Originally built in the 12th century, it was later a residence of Counts of Armagnac. The present massive structure dates from 1620 onwards and it was built on the ruins of medieval castle (destroyed by King's soldiers in 1496).
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.