Introduction : tackling topography -- Preliminaries : Latium, the church, the pope, and Kircher's preface -- It all started with Noah -- Latium's lake country, the Alban Hills -- Villas and a tomb : Tusculum and the Ager Tusculanus -- Praeneste : Barberini town and its mosaic -- Villa country : Tivoli and its surrounding territory -- The Sabines and Volscians -- Draining the Pomptine marshes : a not-so-modest proposal -- Habent sua fata libelli : Fabretti's reading of Kircher -- The legacy of Kircher's Latium