Behind the intriguing title of this volume is a compilation of many of the papers presented during a session of the 15th Congress of the Union Internationale des Sciences Préhistoriques et Protohistoriques held in Lisbon in 2006. The session reviewed the current state of research into the spatial analysis of western Eurasian Palaeolithic and Mesolithic sites. Covering a broad temporal and geographical range, these studies reflect the enormous variety of spatial evidence preserved in the archaeological records of these periods.