How can we unpick the development of Roman towns? Even large excavations only open up modest areas, while traditional geophysical survey superimposes countless different phases of activity. Now, Ground-Penetrating Radar (GPR) has come of age and can provide a virtual slice through the underlying soil. Giovanna Rita Bellini, Alessandro Launaro, Martin Millett, Lieven Verdocnk, Frank Vermeulen provide a breathtaking new view of the Roman towns of Falerii Novi and Interamna Lirenas.