There is a wonderful article about the Grand Concourse by Constance Rosenblum in the Times today:
You have to exercise your imagination to conjure the past; this part of the Bronx is in many respects a diamond in the rough. Many of the lustrous structures that defined life in these precincts have been irrevocably transformed, and even those that haven’t are Potemkin villages, their fine facades masking troubled lives: the Bronx, after all, is still a borough in which one of every three families lives below the poverty line.
But a trip down this particular memory lane has much to recommend it beyond pure nostalgia. As the boulevard nears its centennial in November, a journey offers a vision of its past, present and future — a chewy slice of urban history festooned with murals, mosaics and other Art Deco touches.
While you are at it, dig the nifty multi-media tour too.