Which seat of government has 57,000 people underneath it daily?
City Hall station (SEPTA):  It serves the Broad Street Line and is located in Center City Philadelphia underneath Philadelphia City Hall. City Hall station (SEPTA):  It is the busiest station on the line, serving 57,000 passengers daily. 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.
Philadelphia City Hall