This is a shot of an 8 inch disappearing gun on Mount Victoria, Devonport, overlooking Auckland. It was installed during the 1870s when there were fears of a Russian invasion. Its sister gun on nearby North Head was fired once, breaking many windows in the suburbs, so it was never fired again.
The North Head gun was found buried under a rose garden in the middle of the road in the mid 1970s after a painstaking search by an amateur historian called Paul Titichener - the gun was repatriated to North Head. The Mt Victoria gun was found, still in place, under the tarseal of the carpark. It had been "lost" for decades.
The guns had been hidden during World War 2 because it was feared they would be a target of air strikes. Other guns were cut up and scrapped.