Kirche am Steinhof
At the top of Baumgartner Höhe, in the Sozialmedizinisches Zentrum, is the Kirche am Steinhof, or "Otto Wagner Church".
Unfortunately it is open for visiting on Saturday afternoons only and then in the form of a historical lecture from 3pm to 4pm and individual viewing from 4pm to 5pm. Since I was there on a Monday all I have are exterior shots. Close to the church is a memorial and exhibition to the victims of nazi medical "care".