What is it? The symbol of the city, no less. St. Stephen’s Cathedral has been the fixed point around which Vienna turns since its building in the twelth century. Climb up the 343 steps all the way to the top and you'll be rewarded with some pretty unforgettable views.
Why go? The cathedral’s baroque interior is full of treasures, from bejewelled relics to holy books, as well as the tombs of Viennese luminaries like Emperor Friedrich III and Prince Eugene of Savoy. Make sure you don’t miss the catacombs.