Suomenlinna
A fascinating island sea fortress, Suomenlinna once protected Helsinki's harbor from invasion
Built by the Swedes in 1748 as a bastion against the ever-encroaching Russians, Suomenlinna is one of the worlds largest nautical forts, and is reachable year-round by a brisk ferry ride from the citys Market Square.
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Fort
The fort was interesting though much of it appeared closed as it was Winter. Easy to get to on quick ferry ride.