[Image: The harp-like cabled insides of a New York bridge footing interior, courtesy of the Library of Congress].
Back in 2004, Cryptome offered a carto-photographic look at the bridges and tunnels of New York City, relying on some gorgeous photos taken from the Historic American Buildings Survey (HABS) and the Historic American Engineering Record (HAER) of the U.S. Library of Congress.
That link is particularly worth seeing, however, in the context of this recent interview with Stanley Greenberg, published last week on Urban Omnibus. As Greenberg says, “I think the city is a huge organism, only some of it visible, and we inhabit it, change it, get changed by it. But there is so much of it that I don’t know”—so much of it still undiscovered, including infrastructure often invisible for the fact that it stands proudly in plain view.
There is a spectacular infrastructure underneath the crazy city, Tokyo, as well. It's beauty is even compared with Parthenon temple in Greece.
http://en.wikiarquitectura.com/index.php/G-Cans_Project