It's close to home. It's ten minutes'walk. After dinner, I was bored and went out to sneak here. Philadelphia City Hall is the most expensive, tallest and largest city hall in the United States. It took 30 years to build it. It is also the landmark building of Philadelphia, located in the center of Philadelphia, built in 1901. The building is square, 167 meters high, and has more than 700 rooms. It is like a medieval castle. It has a large scale, complicated decoration and is tall and magnificent. The biggest difference with the domestic municipal government is that there is no police, visitors and citizens are free to enter and leave, very pro-people ah!