
The Bunker
On a stroll along the cycle path at Waterview (in the direction of Te Atatu) I encountered this solid structure next to where Oakley Creek enters the mangroves. No idea what its background could be – open to any stories, real or imaginary!
(Solution below in the comments.)

Bunker Art
It doesn’t take long for infrastructure to start to come apart if it’s been neglected. I wonder if it’s Cold War era.
Solved by Timespanner‘s Lisa Truttman: remains of a Waitemata County Council’s quarry at Mattson’s Flat (in the 1920’s).
https://www.scribd.com/document/7706390/Terminus-3-Mattsons-Flat