The Catacombs of Saint Callixtus are among Rome's largest and most important Christian catacombs, originating around the mid-2nd century AD. Visitors explore an underground cemetery complex spanning 15 hectares with nearly 20 kilometers of galleries on multiple levels, featuring crypts and early Christian burial chambers. The site offers guided tours and the option for groups to arrange liturgical celebrations in underground crypts or above-ground chapels within the catacomb grounds.
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