Then there are mosaics at the West Side 86th Street Station created by students 20 years ago, recently highlighted in the NYTimes.

And this mosaic is a treat as you descend the steps at 42nd Street and 7th Avenue.
Roy Lichtenstein's work tells us where we are, an always welcome aid.
We found these great ceramic (?) bas-relief series, also in the Times Square station.
Here's a great series of Otterness sculptures we found on a blog.
Also, this NY Times article explains Otterness's project for 14th Street and Eighth Avenue Station.

Leaving Manhattan, we trained it to Eastern Parkway in Brooklyn and were met by angels.
We wonder if it is possible to make a day's excursion of viewing subway art all for one fare! Hubs are good for getting that pedometer toward our walking goal. Any one up on transfer routes?