The New York subway system has a huge collection of beautiful vintage tilework marking the various stations in the system. Unfortunately many, like this one, are desperately in need of repair.
A "modernized" station in New York.
Pioneer Square Station on the Seattle Transit Tunnel. Note that the primary users of this tunnel are *buses* -- the light rail system only launched in 2009, over fifteen years after the tunnel opened. These are probably the nicest designed-for-bus stations I've ever seen.