To the publications that deal with non-destructive methods in archaeology we can add this slim volume focused on the geophysical prospecting of religious architecture. Such practices have become increasingly attractive in recent years. One key reason being the ability to examine a site without major intervention, thus preserving it for future generations who will hopefully have better techniques to obtain much more information than is possible today. Arising from current research in this field, in which both authors participate, is the long-term interdisciplinary cooperation of several experts within the “Non-destructive survey of underground space in historic buildings” project. Prior to the initiation of this project both authors published a number of articles on the topic (in such publications as Ve službách archeologie) and it could be said that this book is a summary of some of them, enriched by new research of recent years.