St. Stephen's Cathedral in the heart of the inner city is 107 meters long. The tallest of its four towers is the south tower at 136 meters. The tower room, from which there is a gigantic view across Vienna, is reached via 343 steps. A total of 13 bells hang here. However, the best known of them, the Pummerin, hangs in the 68 meter-tall north tower. It is the second-biggest free-swinging chimed church bell in Europe. On the roof of St. Stephen's Cathedral, colorful roof tiles were laid to create the Royal and Imperial double-headed eagle and the coat of arms of the city of Vienna