If you like this, you'll love Kate Ascher's The Works: Anatomy of a City (http://www.amazon.com/The-Works-Anatomy-Kate-Ascher/dp/01431...). It's slightly out of date (but much more up to date than the OP!).

And if you like that, you'll REALLY love Brian Hayes' Infrastructure: A Field Guide to the Industrial Landscape (http://www.amazon.com/Infrastructure-Field-Guide-Industrial-...). It's porn for people who like to try to figure out what the random towers in a chemical plant do, or how the electrical station you just passed on the interstate works.