I spent a little time in the Owen Sound Jail, though not, thank goodness, as an inmate. It was about 15 years ago, I recollect. I was taken on a guided tour of the facility with other members of the local news media.
One image from that tour still stands in my memory: a row of iron-barred cells, each cell about four feet wide by about nine feet deep, with three stone walls and no window. The word that kept coming to mind then, and comes to mind again now, is dungeon.