7.  Chambers Street Exit at the Municipal Building 

There is a now-defunct subway exit behind the main entrance to the Chambers Street subway station at the Municipal Building in Manhattan. There is a grate and standpipe in place of what was likely an exit staircase to one of the now-abandoned platforms of the station below.

Opened in 1913 as part of the Brooklyn Rapid Transit system, the Chambers Street station served as a terminal for trains coming from the Williamsburg and later the Manhattan Bridges. In 1931, two platforms were closed when the Nassau Street subway (now the J/Z lines) opened. The lost staircase may have been removed at that time.

Next, check out 6 Rarely Seen Abandoned NYC Subway Entrances and The Top 20 Secrets of the NYC Subway