Stephansplatz 3. We found this swastika at the railing of the spiral stairs inside of St. Stephen's Cathedral (Der Stephansdom - Domkirche St. Stephan zu Wien). These stairs twine the pillars but don't tower too high. As you can see, four-rayed swastikas intersperse with three-rayed ones in this pattern. For reference: the first temple on the place of the cathedral was raised in 1137-1147, Stephansdom in the present borders was built in XIII-XV centuries and was brought up to date in 1511. By the way, if you really want you can see some kind of swastika on the ornately patterned tiled roof of the cathedral.