Piarist Church In Vienna, Austria - The Piarist Church, Also Known As The Church Of Maria Treu, Is A Baroque Parish Church Of The Order Of The Piarists Patres Scholarum Piarum In Vienna, Austria. It Is Located In Vienna`s 8th District Josefstadt. The Piaristenkirche Was Elevated To The Rank Of Basilica Minor In 1949. Photo