St Stephen’s Cathedral, Vienna. The current building was finished in 1433. Its massive south tower is its highest point and a dominant feature of the Vienna skyline. For a long time the Cathedral was the highest building in Europe. . During the Siege of Vienna in 1529 and again during the Battle of Vienna in 1683, it served as the main observation and command post for the defence of the walled city; it even contains an apartment for the watchmen who, until 1955, manned the tower at night and rang the bells if a fire was spotted in the city.
