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I've always found that transit stations easily look much nicer in photographs in person, but those are beautiful anyways. One of my personal faves not pictured is the Drassanes metro station in Barcelona, which looks as if it was designed for a Star Wars set. Obviously not to everyone's taste, however.
Many of the old soviet states have amazing stations - Kiev, Khuzik, Tahkent, all incredible. Germany and Sweden are no slouches either! While NY certainly has its nice stations I cant help but feel cheated looking at some of these, especially putting them side by side with your average NYC subway stop.
That makes it that little bit more awesome imo. Imagine how mysterious it is.
That's City Hall station on the 4/5/6. 6 trains use the loop track after terminating one stop up the line to head back uptown. Tours do happen and once upon a time riders could remain on the train as it went through the loop but I think security measures after 9/11 shut that down.