Fort Takapuna

From the web page of the Department of Conservation Te Papa Atawhai:

Fort Takapuna was part of a chain of new defences around Auckland harbour. Other forts were built at North Head, Bastion Point, Point Resolution (above the Parnell Baths), and later in 1899 on Mount Victoria. This fort housed two 6 inch disappearing guns which controlled the approaches to the Rangitoto Channel. These guns were mounted in the two circular gun pits in the underground part of the fort.