St. Stephen's Cathedral defines the city centre and has been the heart of Vienna for centuries. It is one of the most famous Viennese sights and was built in 1147 AD. For a long time it was uncontested as highest building in Europe measuring almost 137 m.
Religious - Christianity
Duke Rudolf IV of Habsburg ordered the complete restructuring of the church in Gothic style. In 1359, he laid the cornerstone of the nave with its two aisles. The South Tower, was completed in 1433 (the Viennese have given it the nickname "Steffl," representative of the whole cathedral).