Small Parterre The Mirabell Gardens were laid out in 1687 during the reign of Prince-Archibishop Johann Ernst von Thun. It was designed by Johann Bernhard Fischer von Erlach within the Mirabell palace grounds and redesigned a few times over the years. One of the characteristics of a Baroque garden is how it incorporates vistas outside the garden into its design. This feature is evident from Rosehill, on the south side of the Palace. Our eyes are drawn from the Small Parterre to the Fountain of Pegasus and beyond to the dome and steeples of the Cathedral of Salzburg and Hohensalzburg Fortress.