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Which historic sea fortress, a UNESCO World Heritage site, guards the entrance to Helsinki's harbor?

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Correct answer: Suomenlinna

Suomenlinna, often called the 'Gibraltar of the North,' is an 18th-century sea fortress built on a group of islands off Helsinki. It served as a vital defensive outpost for centuries, first under Swedish, then Russian, and finally Finnish rule. Now, it's a popular tourist attraction and a residential area, with its unique military architecture and history earning it UNESCO status. Photo: Migro, Wikimedia Commons, Public domain.

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Source: Wikipedia (CC BY-SA)

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