This book ranks as one of Macaulay's best, as it reveals the networks of systems that are the lifeblood of a city, from various building foundations to sewers to subways, showing how they are constructed and sometimes interact with each other. The text, though minimal, is packed with information, which is supplemented by the superb and detailed drawings. One of the coolest aspects of the book, though, is the views from below, as if a rat with x-ray vision were able to gaze up at this intricate maze of technological wonders. Macaulay's sense of humor is evident throughout, as seen by his inclusion of various critters (including an alligator and an elephant), lots of references to dogs and fire hydrants, a billboard ad for his book PYRAMID, and even a human skull and hand (!!) in one drawing of an excavation. Great fun to read and highly recommended.