The church of Järva-Madise was originally built as a fortress-church in the end of 13th century. The present appearance is mostly from the 14th century. The wall paintings, altar and pulpit of Järva-Madise church originate from the Middle Ages, the tradition to burry inside the church is reminded by grave plate hewed in the floor.
You can visit Järva-Madise church in summer months from Friday to Sunday.
Reference: Visit Estonia
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.