How did Johann Bernhard Fischer von Erlach transform an old quarry in Salzburg?

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Johann Bernhard Fischer von Erlach transformed an old quarry in Salzburg by converting it into a summer riding school. This project was part of his broader work as an architect for Johann Ernst, Count von Thun, the archbishop of Salzburg, which also included designing a new facade for the archbishop’s stables and laying out a square in front of them.1