St. Stephan's Chathedral, Vienna, Austria (UNESCO)

Great view of St. Stephan's Cathedral in Vienna, Austria. Built on the remains of two earlier churches dating back to 1147, the current Romanesque and Gothic looks goes back to Duke Rudolf IV (1339-1365). It is the seat of the Archbishop of Vienna and part of the UNESCO World Heritage Site Historic Center of Vienna.
Also interesting to see is the progress of renovation and cleaning of the facade. Due to ages of being exposed to airpollution, the stone was covered with soot, making the building seem black, dark and gloomy. Now, after years of cleaning a great part of the facade now looks like in the days when it was first constructed.
I received this card from my parents.