Karlskirche (St. Charles's Church) is a baroque church located on the south side of Karlsplatz in Vienna, Austria. Widely considered the most outstanding baroque church in Vienna, as well as one of the city's greatest buildings, Karlskirche is dedicated to Saint Charles Borromeo, one of the great counter-reformers of the sixteenth century. Located on the edge of the Innere Stadt, approximately 200 meters outside the Ringstraße, Karlskirche contains a dome in the form of an elongated ellipsoid.