Final answer:
A pilgrimage church is a type of sacred architecture built along pilgrimage routes to house relics and accommodate large numbers of visitors. These churches typically feature a double aisle, radiating chapels, and a cruciform plan to control the flow of pilgrims.
Step-by-step explanation:
A pilgrimage church is a type of sacred architecture that was constructed along pilgrimage routes to accommodate large numbers of visitors seeking to venerate relics. These churches often had a double aisle on either side of the nave, allowing pilgrims to easily move around and visit the smaller radiating chapels where relics were displayed. The design of pilgrimage churches, such as the cruciform plan and the presence of protruding radiating chapels, helped control the flow of pilgrims and ensure they could access the relics without disturbing the Mass in the center of the church.