Beneath the modern streets of Rome lies a vast network of ancient subterranean cemeteries known as catacombs, which served as burial sites primarily for early Christians, Jews, and pagans. These extensive tunnels were carved into volcanic rock starting in the second century to address legal bans on urban burials and the high cost of land. Today, visitors can explore select sites like San Callisto and Domitilla to view historic frescoes, intricate wall niches, and early religious symbols. Because these labyrinths are complex and fragile, official guided tours are mandatory for anyone wishing to experience the cool, quiet atmosphere of these underground corridors. While popular myths suggest these were secret hiding spots, they functioned mainly as sacred places for remembrance and honoring the deceased. Ultimately, these sites provide a unique window into ancient funeral traditions and the evolution of faith during the Roman Empire.