Sea Fortress Suomenlinna, Helsinki (Finland)

Suomenlinna is an 18th-century sea fortress and nature area with centuries-old artillery and defensive walls spread across 6 linked islands. Walking trails cross parkland between popular sights like the Kings Gate drawbridge and Suomenlinna Museum which recounts military and maritime history. Submarine Vesikko lets visitors explore a restored 1930s vessel. Theres also a brewery and several waterside restaurants.

Sea Fortress Suomenlinna Helsinki Finland 00190
60.148884 24.984615