Suomenlinna is an inhabited sea fortress built on six islands which now forms part of the city of Helsinki, the capital of Finland. It's also a garrison town and a base for archipelago navy. In 1991, the fortress was added to the UNESCO World Heritage List as a unique monument of military architecture.
Unesco: Fortress of Suomenlinna
Distance: 1,741 km (1,082 miles)
Travel time: 4 days
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