The Cathedral has been through many reconstructions. Dating back to 1147 when the first church went up, the Cathedral has shown a lot of resilience. St. Stephen's Cathedral is in the heart of the inner city and is 107 meters long. The tallest of its four towers is at 136 meters. The tower room, has beautiful views of Vienna. That original 12th-century church is no more, the main entrance door, is a great incarnation of its origins from the 13th century. The roof of St. Stephen's Cathedral is constructed with ornately patterned, richly coloured, glazed tiles. (230,000 tiles) Sadly, Stephansdom survived the aerial bombings of WWII only for a fire in nearby buildings to spread to the cathedral in April 1945, destroying parts of the building. Joseph Haydn and Wolfgang Amadeus Mozart are just two of the important figures to have been married here.