With over 6 million visitors per year, St. Stephen’s Cathedral (or Stephansdom) is one of the most-visited sites in Vienna. It’s the seat of the Archbishop of Vienna, as well as being the designated central point of the city. Visitors can explore the Romanesque and Gothic cathedral interior, take a guided tour of the catacombs, or climb to the top of either the North or South Tower for a fantastic view of the city center.