Some of the houses of the inhabitants of the island of Suomenlinna (Sveaborg). Suomenlinna (Finnish), or Sveaborg (in Swedish), is a fortress built on six islands, in Helsinki, the Finnish capital. It is part of the World Heritage Site of UNESCO and it is a tourism hotspot. Its original name was Sveaborg (Swedish castle), they changed the Finnish Suomenlinna (Finland's Castle) for patriotic reasons, but both Swedish and Swedish-speaking Finns they still know by its original name. Sweden began aa built the fort in 1748, as a protective measure against the expansionism of Imperial Russia. The fortification was responsible for Augustin Ehrensvärd. The original plan was influenced by the precepts of Vauban, military engineer of his time. In addition to the island fortress, fortifications overlooking the sea from the mainland claimed that an enemy could not dock at a beach. The defense plan included ammunition storage for the Finnish contingent of the Swedish Army and Navy. During the War of Finland, the fortress surrendered to Russia on May 3, 1808, making the occupation of Finland by Russian forces in 1809. During the Finnish Civil War in 1918, the castle was used as a POW camp by the Red Guards. Today, Suomenlinna is also a district of Helsinki exceptional, with some 850 inhabitants and 350 jobs (increasing in summer, for its tourist attraction).