I used to think I had a pretty good sized vocabulary, but since moving to NZ I feel a bit inadequate with terribly English words. This is
a fort a redoubt in the tiny town of Manaia in Taranaki. The tower stands in the middle and there are two little white shelters with holes for shooting at the enemy. There was a fence surrounding the area inside the trench .
Inside the white building. Looks like they could close the holes from the inside.