In the fourteenth century, a gothic church stood at Mariazell with a 90 m high spire and an ogive portal. In 1420 and 1474, the church was destroyed by fire. The church building was later expanded and redesigned in the Baroque style by Domenico Sciassia from 1644 to 1683. To the left and right of the gothic spire, a baroque tower was built, the nave was lengthened and widened, and a dome was added on the eastern side. The high altar, consecrated in 1704, was designed by Johann Bernhard Fischer von Erlach.