When was one of the tallest structure built which is taller than The Milwaukee City Hall and is the seat of government for the city of Philadelphia?
Philadelphia City Hall Philadelphia City Hall, built in 1901 and located at 1 Penn Square, is the seat of government for the city of Philadelphia, Pennsylvania.
History of the world's tallest buildings The tallest building in the world as of 2017 is Burj Khalifa. Before Burj Khalifa, the title of "world's tallest building" has been borne by various buildings, such as Rouen Cathedral and the Empire State Building.