The foundations of an ancient Roman crypt dating from the first centuries of our era was uncovered in 1978 in the central area of the Dax. After the archaeological excavations, an archaeological crypt was built under the building to keep the testimonies of the ancient city. Long considered the foundation of a temple, the remains are now interpreted by archaeologists as belonging to a civil basilica, public meeting place where many activities took place in civic life; made there including justice. Few basilicas are known in the Roman world to this day. The most important archaeological museum in the crypt are presented.
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.