Otto Wagner Church or Steinhof Church, (Kirche am Steinhof) - also called the Church of St. Leopold, was built between 1903 and 1907 by the 63-year-old architect Otto Wagner.
It is considered one of the most important Art Nouveau churches in the world.

The wonderful stained glass window panes (1904) were manufactured after drawings of Koloman Moser (1868-1918).