2.5 stars, coming from someone who *loves* "urban spelunking." The photographer is a former city employee, probably friends with the civil servants that manage the locations he photographs. The photographs themselves are quite well-done, even if I don't care for the subject matter. This was bought as a gift for a friend, and I'm now going to have to give it with a caveat, "it just isn't that striking."
Having read accounts of the life of homeless/hobos/indigent people (depending on what they want to be called) who live in, for example, the miles of underground railway tunnels that run under NYC (not just the subway, but larger, spacious railways, with terminals, switches, yards, everything you'd find above-ground on a staggering scale), I expected something similar, but with infrastructure itself. There are indeed some great shots, but they are interspersed with shots of, for example, a large valve that will be part of Water Tunnel #3, the ongoing construction project to bring more water to the city. While this is an impressive architectural feat, something to give the Romans a run for their money, the photos come across as sterile (which, it is noted in the foreword, is sort of the point of the construction, to be sterile and functional).
In fact, I feel one of the points the book is trying to make is that older public works projects were things of beauty as well as function, where today's projects are function first, with form/beauty following that function (the foreword makes this point, too). And so tunnel #3 may not be as beautiful, say, as a water pumping station in Brooklyn completed in the early 1900s, but it has a "beauty" of function all its own. Think of the "beauty" of an early Porsche or Jaguar, more aesthetics and "feel" than function, versus the "beauty" of a modern hybrid car, with excellent fuel mileage, reliability, and safety. They are two different types of beauty. That is, I think, the main drive of the book.
All that said, as a work of "art," it is very dry. As an argument about the changing nature of public works, it does very well.