The densely populated Campi Flegrei resurgent caldera is one of the widest known, best studied and highly dangerous volcanoes of the world. This monograph synthesizes the current knowledge of this volcano, through different review chapters. The chapters of this book are dedicated to specific volcanological aspects, authored by well-recognized experts. The volume attempts to cross the barriers between the volcanological, geological, geochemical and geophysical perspectives, and offers a comprehensive and up-to-date reference to earth-science scholars, as well as land planners and civil defence officers.