Suomenlinna (fortress) built
1748 CE.
Shown on the map at 60.144°, 24.984°.
Suomenlinna (Finnish: [ˈsuo̯menˌlinːɑ]), or Sveaborg (Swedish: [ˈsvɛːɑˈborj]), is a sea fortress composed of eight islands, of which six have been fortified. Located about four kilometres (2.5 mi) southeast of the city center of Helsinki, Finland, Suomenlinna is a popular destination for both tourists and locals, who enjoy it as a picturesque picnic site. Construction of the fortress began in 1748 under the Swedish Crown as a defense against Russia. The general responsibility for the fortification work was given to Admiral Augustin Ehrensvärd. The original plan of the bastion fortress was heavily influenced by Vauban, a renowned French military engineer, and incorporated the principles of the star fort style of fortifications, albeit adapted to a group of rocky islands. During the Finnish War, Russian forces besieged the fortress in 1808. Despite its formidable reputation as the "Gibraltar of the North", the fortress surrendered after only two months, on 3 May 1808.
Text from the Wikipedia article Suomenlinna, licensed CC BY-SA 4.0.