The Stephansplatz is a square at the geographical centre of Vienna. It is named after its most prominent building, the Stephansdom, Vienna's cathedral and one of the tallest churches in the world. Before the 20th century, a row of houses separated Stephansplatz from Stock-im-Eisen-Platz, but since their destruction, the name Stephansplatz started to be used for the wider area covering both. To the west and south, respectively, run the exclusive shopping streets Graben (literally "ditch") and Kärntner Straße ("Kärnten" is the German for Carinthia). Opposite the Stephansdom is the Haas-Haus, a piece of striking modern architecture by Hans Hollein. Although public opinion was originally skeptical about the combination of the mediæval cathedral and the glass and steel building, it is now considered an example of how old and new architecture can mix harmoniously .