This first volume initiates the new series of Hypogean Archaeology (Research and documentation of underground structures), within the larger production of British Archaeological Reports. It is a study which promotes the archaeological, architectonical, speleological and historical investigation of artificial cavities. The Italian Cadastre of Artificial Cavities ‘I’ covers the first fifty-five index cards relative to the underground works registered in the three Italian regions of Lombardy, Piedmont and Tuscany. Intended as an initial contribution to the classification and to the knowledge of artificial cavities, the cadastre includes a “Classification of artificial cavities by typology”, essential for an understanding of the vast range of underground cavities. The texts are written by Roberto Basilico, Luigi Bavagnoli, Stefano Del Lungo, Gianluca Padovan, and by Klaus Peter Wilke as editorial co-ordinator. Ivana Micheli from Edinburgh has translated the volume and Roberto Basilico, Luigi Bavagnoli, Andrea Busi, Alessandra Casini, Claudia Ninni, Andrea Thum, Davide Padovan, Gianluca Padovan, Maurizio Radacich, Klaus Peter Wilke and Domenico Zanon are the authors of the photographies.