The Pakri Lighthouse in Paldiski was built in 1889 and it is the tallest one (52m) in Estonia. There are also remains of the massive lighthouse which was completed in 1760 in place of an old Swedish period light beacon.
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.