Philadelphia boasts some of the greatest architectural works in the country. City Hall is one of them. Construction of it started in 1871, and was completed in 1901. While it was one of five designated public spaces, (as it was once an empty dirt lot, sometimes used for public hangings) it evolved into 14.5 acres of floor space, almost 700 rooms, and offices and chambers for the city’s executive, judicial, and legislative branches, Philadelphia City Hall is the biggest municipal building in America. It is taller and has more rooms than the U.S. Capitol Building. For almost 100 years, it was Philadelphia's tallest building.
Constructed of brick, marble, and granite, with no steel or iron framing, City Hall is the tallest masonry building in the world and one of the largest overall. More than 88 million bricks were used in the building’s construction, and the walls of the tower are up to 22 feet thick near its base.
With a bit of landscaping, and design genius, the surrounding grounds are now used for ice skating, concerts, art installations, festivals, even first run movies on an outdoor portable screen.