Auckland is amazing when it comes down to how much has survived. The whole WW2 fortress system for Auckland has survived.
North Head (Devonport)
Russian Scare throught to WW2. Intact, and mostly open to public. Contains an 8" disappearing gun. Summit and North Battery Tunnels are currently locked and inaccessable to the public.
Fort Takapuna (Takapuna Head)
Russian Scare through to WW2. Intact, now administered by the Department of Conservation, accessible to the public, but need to organise a visit if you want access to everything. Contains the last remaining example of a Tudor-Boddam style fort (though modified).
Fort Bastion (Bastion Point)
Russian Scare though to WW2. Original fort is now part of Michal Joseph Savage's memorial. WW2 fortifications are mostly there (bar the twin 6pdr emplacement) and are open to the public. The original fort was built to the Tudor-Boddam style, although without the brick barracks.
Fort Victoria (Mt Victoria)
Russian Scare. Intact and open to the public. Contains an 8" disappearing gun.
Fort Resolution (Point Resolution)
Russian scare. largely destroyed and now a park
Castor Bay Fort (Castor Bay)
WW2. Intact, and some buildings are open to public. The tunnels connecting the guns and the magazine are closed off.
Motutapu Fortress (Motutapu Island)
1930s Fort, 6" CB Battey, Auckland version of Palmer Head. Intact (including protective pill boxs) and open to public.
Stony Batter (Waiheke Island)
WW2 9.2" CB Battery. Intact and open to the public. (including some of the protective pill boxs)
Whangaparaoa (Whangaparaoa Peninsula)
WW2 9.2" CB Battery. Intact, but currently being used to store ammo for the navy. So not open to public. (including some of the protective pill boxs)
Fort Jervois (Ripa Island)
Russian Scare, intact and open to the public on the basis of guided tours. Contains two disappearing guns, one 6-inch and one 8-inch. The remains of the other two disappearing guns (6-inch & 8-inch) are on the island as well.
Battery Point
Russia Scare through to WW2. Intact but on private land. It can be accessed by arrangement with the Lyttelton Port Company.
Erskine Point
Russian Scare. Partly intact and accessible. The emplacement remains, but the magazine for the emplacement was blown up in the 1970s.
Spur Point
Russian Scare. Destroyed.
Godley Head
WW2. Intact and open to the public.
Fort Taiaroa (Taiaroa Head)
Russian Scare. Intact, but access is strictly controlled because of the Albatross colony located here. Some areas open, others are not. A 6" disappearing remains here, and has been restored to working order. Can be visisted on the basis of a guided tour.
Harrington Point
Russian Scare through to WW2. Intact and accessible to the public.
St Clair
Russian Scare. Apparently destroyed.
Laywers Head
Russian Scare. Apparently destroyed.
Central Battery (Ocean Beach)
Russian Scare. Apparently destroyed. Rumours of it just being buried are around. It was built to the Tudor-Boddam style.
Tomahawk
WW2. Intact and mostly accessible by the public. The magazines at the rear of the emplacements have been sealed and are inaccessible. The observation post and the free standing magazine are on private land.
Rerewahine
WW2. Intact and accessible by the public. The battery is actually on private land, but guided tours are avaliable.