St. Peter's Basilica is NOT the cathedral of Rome. San Giovanni in Laterano is. Omnium Urbis et Orbis Ecclesiarum Mater et Caput — Mother and Head of all churches of the city and the world. It says so on the facade, in letters large enough that you shouldn't miss it, but most tourists do because they're walking to the Colosseum. This is where Christianity became OFFICIAL. Constantine gave the Lateran Palace to Pope Miltiades in 313 AD, and the basilica built here was the FIRST public Christian church in Rome — before St. Peter's, before Santa Maria Maggiore, before anything. The Pope's cathedra (throne) is HERE, not in St. Peter's. When the Pope speaks ex cathedra — "from the chair" — THIS is the chair.
The facade (Alessandro Galilei, 1735): 15 colossal statues on top — Christ, John the Baptist, John the Evangelist, and 12 Doctors of the Church — visible from across Rome. The facade is LARGER than St. Peter's, and deliberately so. The interior (Borromini, 1646-49): Borromini was called in to "modernize" the medieval basilica for the 1650 Jubilee. He kept the original plan but encased the ancient columns in massive pilasters, placing 12 Apostle statues (each 4.6m tall, by various Baroque sculptors) in niches between them. The effect: you walk between the Apostles. They LOOK at you. The scale is intimidating. This is architecture as theology. The Cosmati floor (13th century): Geometric marble inlay — the most complete surviving example of the craft that defined medieval Roman decoration.
The cloister (1215-1232, Vassalletto): THE most beautiful medieval cloister in Rome. 126 paired columns — twisted, inlaid, mosaic-decorated — surrounding a garden with a well at the center and fragments of the original basilica embedded in the walls. €5. If you see one cloister in Rome, this one. The Scala Santa (across the piazza): 28 marble steps that tradition claims are the stairs Christ climbed in Pontius Pilate's palace in Jerusalem. Brought to Rome by Helena, Constantine's mother (326 AD). Pilgrims climb them ON THEIR KNEES. Martin Luther climbed them on his knees in 1510 — and, according to his own account, stood up at the top thinking "who knows whether this is true?" The Protestant Reformation may have begun HERE, on these stairs. Free. Open daily.
Piazza di San Giovanni in Laterano. Metro A: San Giovanni. Basilica: free. Cloister: €5. Scala Santa: free (across the piazza). Baptistery (the oldest in Rome, octagonal, 432 AD): free, beside the basilica. Allow 1-1.5 hours for basilica + cloister + Scala Santa. Go in the morning when the light through the nave windows illuminates the Cosmati floor. Hidden churches → · 7 days →