6. How to See the Old City Hall Subway Station
The official way to visit the old City Hall subway station is to join the New York Transit Museum and get on the tours they usually run there twice a year. The Museum is unfortunately not offering tours at this time. When the tours do run, tickets usually sell out in about an hour so you need to be on top of your game.
Alternatively, the unofficial way to see the station is to stay on the 6 train and ride through the turnaround as the train shifts from downtown to uptown. If the lights are on in the station, you’re in for quite a treat.