The final building on Old Great Square is this, the Cathedral School. Founded in 1276, it is the oldest educational establishment in what is now Finland — although the current building, like the others now standing in the square, dates to the 1830s. A 1977 educational reform resulted in the Cathedral School being integrated with the regular City of Turku public school system, and it is now a lukio, an “upper secondary” school for 15-to-18-year-olds intending to go to university. We’d call it a “prep school”, since the goal is to prepare pupils to take the university entrance exams.