The series comprises four volumes, which reprint 70 articles and chapters (of which no more than 25% will be chapters from edited volumes). The final shape of the four volumes is not yet definitively known, but is likely to be: Volume 1 (methodology and definition of the field), Volume 2 (historical material, ancient, medieval, early modern etc), Volume 3 (specific examples of modern pilgrimage and spiritual tourism), and Volume 4 (secular and civil religious/spiritual travel).