Wiener Sängerknaben
In 1918, when World War I drew to its close, the castle became a military hospital and was subsequently used as a rehabilitation center for veterans. In 1927, the City of Vienna purchased the entire estate from the Zurich banker Wilhelm Ammann and established an orphanage there. From 1934 to 1938, the castle served as the home base for the world-famous Vienna Boys' Choir.