Hidden deep under New York City, a “secret” subway stop is drawing visitors.

The Big Apple’s City Hall station, a beautiful structure that opened in 1904, but has been out of use for decades, can be seen by riders … if they know how to make the journey. If you want to check out this long-forgotten station, one of the “most gorgeous gems in the world of mass transit,” you’ll have to take the 6 train and then stay on board. The 6 train used to make all passengers leave the train at the Brooklyn Bridge stop, but no longer. If you have a little extra time, you can stay on the train and view the City Hall station as the train makes its turnaround. So why was the station closed so many years ago? The station’s curved tracks played a part in its closure. When subway cars moved their doors to the center, it “created an dangerous gap between the exit point on the train and the platform.” There were plans to make the stop into a transit museum, but security concerns, especially following the events of 9/11/01, put the plan in limbo. Now, though, folks who take a little extra time amid New York’s hustle and bustle can spy the station with their own eyes.

Cincinnatti, Ohio has something unusual too: an abandoned / never built subway.