A week ago in the morning I was able to go on a tour of the historic City Hall Loop–(52 photos, including some from the Subway Centennial). We entered and left the station on the 6 train.
I’m presently wrapping up an internship for DCP nearby and when I went for a quick walk to eat my lunch after our tour I added some photos of the station’s evidence in City Hall Park (if only the cobblestone area outside City Hall didn’t have restricted access):
Enjoy!