The movement of Christian missionaries across the world in the nineteenth and twentieth centuries is perhaps one of the most studied aspects of religious history in recent times. This very engrossing online digital collection brings together over 10,000 photographs culled from various missionary photographers. The Internet Mission Photography Archive (IMPA) is based at the University of Southern California and includes photographs from the collections of the Moravian Church, the Leipzig Mission, the Norwegian Missionary Society, and three other organizations. In this collection, visitors can view churches, school buildings, mission teachings, religious practices, and a constellation of subjects and themes. Users can browse around at their leisure, create their own dedicated collection, and also search the archive by words, contributing organization, and country. Religious historians, photographers, and others will certainly want to visit this collection several times.