Munsbach Castle was built in 1775 in Baroque style. It has two towers and a number of dependent buildings. It now belongs to the Institut Universitaire International Luxembourg which provides educational courses in business, European law and public sector management.
References: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.