It’s late June. The thermometer at Karlsplatz reads 32°C in the shade. Tourists slow their pace on the Ring. A child cries near Stephansdom. An old Wiener crosses the Graben in straight lines, head down — because she knows where the city keeps its quieter, cooler corners, even on a day like this. And very soon, thanks to So Vienna, you will know them too.
That Viennese...