Harington Point and it's tunnels with guns
In 1873 New Zealanders were afraid of Russian warships invading because of a prank newspaper article in Auckland (click here), which basically went along the lines of telling all of Auckland that the city was under siege from an Iron Clad Russian Warship named 'Kaskowiski', and they had taken our principal citizens hostage. All that and it wasn't even April fools. Just for kicks really. What ever the premises, we needed some sort of coastal fortifications, as we had none. Around all our harbors we built bunkers and gun pits, which still stand to this day. Harington Point is one such fortification that is now a reserve that you may visit. Not the best place to bring young children, but do bring a torch and a camera. Lots of interesting buildings here.
Directions
From Dunedin, drive about 45 minutes down the peninsular to Harington Point, from here drive just a little bit further till you pass by some concrete walls and circular blocks. Park just up a bit on a gravel pull out before the corner at the crest of the hill. Walk up to the corner and look down. You will see heaps of bunkers to go explore.