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In front coastline of Helsinki you can have a cruise with local ferry companies. We paid a visit to the old Sveaborg castle, the "Suomenlinna fortress".
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A short list of places that can be seen during the cruise
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One of the most often photographed sights in Suomenlinna fortress
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Suomenlinna fortress has some places that are not easily reachable
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Kustaanmiekka strait in Suomenlinna fortress