San Pedro prison in La Paz, Bolivia is a small place; a high walled, nearly windowless building that occupies a city block. There's a nice courtyard across from the main entrance. I used to sit in it for several hours a day during the three weeks I spent in La Paz, talking with locals and playing guitar.
I didn't realize it was a prison at first. Women and children came and went all day through the guarded entrance, the women with boxes of foods or goods for sale and the children with little school backpacks.