My friend Mike is a treasure trove of local lore. He's mentioned that certain abandoned Subway stations are still visible by riders today, if they know where and when to look for them. I asked for the details and this is what he wrote:
The three easiest and clearest ones to see are on the 6.?There's the 18th Street station just north of Union Square that the 6 passes (and the 4 and 5–but on the inside track, so it's not as good of a view).
There's also the old Worth Street station which is between the Brooklyn Bridge/City Hall and Canal stations (same trains: 4, 5 & 6).
The last one is the old City Hall station. The first and grandest station in the whole subway system, it's were the 6 train spins around in after it leaves the Brooklyn Bridge/City Hall station to head back uptown. If you can sneakily stay on the 6 train as it loops around heading back north you can get a glimpse of this one.?
There are other weird things as well, like City Hall Station on the NRW Line. It has an unused lower level with two tracks and a platform. You can see a staircase for it.
Hoyt-Schermerhorn station, in downtown Brooklyn, has two unused outer tracks and platforms that are unused. They go to the transit museum, which used to be the Court Street station.
There's also a Myrtle Ave station on the Brooklyn side of the Manhattan Bridge. This one is hard to make out because a lot of it has been removed. But if you take a N, D, Q or B across the Manhattan bridge, there's a weird exit and platform you can make out in there.?
There's also that abandoned trolley station that's inside the JMZ at Essex, or so Mike thinks. Keep his tips in mind the next time you find yourself at the end of the line on the 6.