The goal of this book is to provide a general understanding of the engineering principles that govern the seven infrastructure systems that power modern society: water, wastewater, transport, electricity, gas, solid waste, and telecommunication. The focus is on the planning and operation of specific infrastructure, whether physical (e.g., water conduits) or an offered service (e.g., public transport). Along the way, the book identifies their biggest flaws and discusses how they can evolve to become more sustainable and resilient.