Based on recent archaeological excavations, this chapter presents an overview of the Christianization of Gaul through buildings and topography. Over the last few decades, our knowledge of the organization of episcopal complexes in cities and funerary areas has been significantly advanced despite the small number of artifacts, many of which are poorly dated. The study of Christianization in the countryside is a more recent development, even though many Roman villas reused by churches in the Early Middle Ages have been excavated. New research shows the greater complexity of the situation, including settlement forms beyond villas and a variety of churches such as episcopal relays, funerary churches, and monasteries.