Klagenfurt am Wörthersee, usually known as simply Klagenfurt, is the capital and largest city of the Austrian state of Carinthia, as well as of the historical region of Carinthia including Slovene Carinthia. The city is located on Lake Wörthersee and the Glan River. Historically, the place was founded by the Spanheim Duke Herman as a stronghold sited across the commercial routes in the area. Its first mention dates from the late 12th century in a document in which Duke Ulric II.

The Old City, with its central Alter Platz and the Renaissance buildings with their charming arcaded courtyards, are a major attraction. The Lindworm fountain of 1593 with a Hercules added in 1633, is located on Neuer Platz in the Innere Stadt. The Landhaus is located between Heiligengeistplatz and Alter Platz on the edge of the oldest part of downtown Klagenfurt. The Klagenfurt Cathedral is the cathedral of the Roman Catholic Diocese of Gurk-Klagenfurt and also the main parish church of Klagenfurt.