The City Hall station was meant to be the crown jewel in the city’s new subway system and was opened in 1904 and closed on December 31, 1945.
Recently, the MTA changed the rules to allow passengers to ride through the gorgeous City Hall station. Although the station is still closed to passengers, you can get a glimpse of the former glory of this interesting piece of New York history by sitting back and relaxing while the number 6 makes it loop.
The video gives a great insiders view of the history of the station.[SOURCE](http://weburbanist.com/2011/01/05/subterranean-history-beautiful-abandoned-nyc-subway-station/)