Gressholmen harbour in Oslo, Norway. This was the location of Gressholmen Airport Norwegian, a water aerodrome. It served as the main airport serving Oslo from 1927 to 1939, along with Kjeller Airport. The aerodrome consisted of docks, a landing ramp, terminal building and a hangar and used a section of the Oslofjord as its runway. Most of the current buildings were originally build for the aerodome.