Our cities' sewers are some of the most incredible structures in the built environment. In a new book, "An Underground Guide to Sewers: or: Down, Through and Out in Paris, London, New York, &c." historian Stephen Halliday explores the systems (and people) that deal with our shit so we don't have to. From the book description:
Halliday begins with sanitation in the ancient cities of Mesopotamia, Greece, and Imperial Rome, and continues with medieval waterways (also known as "sewage in the street"); the civil engineers and urban planners of the industrial age, as seen in Liverpool, Boston, Paris, London, and Hamburg; and, finally, the biochemical transformations of the modern city. The narrative is illustrated generously with photographs, both old and new, and by archival plans, blueprints, and color maps tracing the development of complex sewage systems in twenty cities. The photographs document construction feats, various heroics and disasters, and ingenious innovations; new photography from an urban exploration collective offers edgy takes on subterranean networks in cities including Montreal, Paris, London, Berlin, and Prague.
More images at Smithsonian: "These Photos Capture the World's Sewer Systems When They Were Brand New"