High Quality Content by WIKIPEDIA articles! Philadelphia City Hall is the house of government for the city of Philadelphia, Pennsylvania. At 167 m (548 ft), including the statue, it is the world`s second-tallest masonry building, only .5 m (1 ft 8 in) shorter than Mole Antonelliana in Turin. The weight of the building is borne by granite and brick walls up to 22 feet (6.7 m) thick, rather than steel; the principal exterior materials are limestone, granite, and marble.