The Papal Basilica of St. Paul Outside the Walls (Italian: Basilica Papale di San Paolo fuori le Mura), commonly known as St. Paul's Outside the Walls, is one of Rome's four ancient, papal, major basilicas,[a] along with the basilicas of St. John in the Lateran, St. Peter's, and St. Mary Major. The basilica is within Italian territory and not the territory of the Vatican City State, but the Holy See owns the Basilica, and Italy is legally obligated to recognize its full ownership and to concede to it "the immunity granted by International Law to the headquarters of the diplomatic agents of foreign States"

The Cathedral of the Most Holy Savior and of Saints John the Baptist and the Evangelist in the Lateran, (Italian: Santissimo Salvatore e Santi Giovanni Battista ed Evangelista in Laterano) – also known as the Papal Archbasilica of St. John [in] Lateran, St. John Lateran, or the Lateran Basilica – is the cathedral church of the Diocese of Rome in the city of Rome, Italy and therefore houses the cathedra, or ecclesiastical seat, of the Bishop of Rome, the Pope.

The Basilica di Santa Maria Maggiore is a Papal major basilica and the largest Catholic Marian church in Rome, Italy, from which size it receives the appellation "major". The basilica enshrines the venerated image of Salus Populi Romani, depicting the Blessed Virgin Mary as the help and protectress of the Roman people, which was granted a Canonical coronation by Pope Gregory XVI on 15 August 1838 accompanied by his Papal bull Cælestis Regina.

كنيسة القديس بطرس البابوية في الفاتيكان (بالإيطالية: Basilica Papale di San Pietro in Vaticano)، أو ببساطة كنيسة القديس بطرس (بالإسبانية: Basilica Sancti Petri)، هي كنيسة من عصر النهضة الإيطالية في مدينة الفاتيكان، الجيب البابوي داخل مدينة روما. صممها بشكل أساسي دوناتو برامانتي ومايكل أنجلو وكارلو ماديرنو وجيان لورينزو برنيني، وهي أشهر أعمال العمارة في عصر النهضة وأكبر كنيسة في العالم. ورغم أنها ليست الكنيسة الأم للكنيسة الكاثوليكية ولا كاتدرائية أبرشية روما، إلا أن كنيسة القديس بطرس تعتبر واحدة من أقدس الأضرحة الكاثوليكية. وقد وُصفت بأنها "تحتل مكانة فريدة في العالم المسيحي" و"أعظم كنائس العالم المسيحي".