An art nouveau masterpiece created by Franz von Matsch in 1911, this mechanical clock was named after the Anker Insurance Co, which commissioned it. Over a 12-hour period, figures including Roman Emperor Marcus Aurelius (who died in Vienna in AD 180), Josef Haydn, Eugene of Savoy, Maria Theresia and others pass across the clock face, indicating the time against a static measure showing the minutes. At noon, all the figures trundle past in succession to the tune of organ music.

Once the centre of the Roman outpost, the Hoher Markt is Vienna’s oldest square.