Early civilian air travel in Northern Europe. Aerial view of a strait and island (probably Suomenlinna) near Helsingfors or Helsingford (present-day Helsinki), Finland. Boats docked in Helsingin satama (Port of Helsinki) with Uspenski Cathedral (Kanavakatu 1, 00160 Helsinki, Finland) in background. View of Market Square (Eteläranta, 00170 Helsinki, Finland) with Uspenski Cathedral and Tsarina's Stone in background.