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St. Peter's Basilica stands in Vatican City on the traditional burial site of the apostle Peter. Constantine’s 4th-century basilica was replaced from 1506 under Julius II; Bramante’s Greek-cross plan evolved through Michelangelo’s dome (completed 1590) and Carlo Maderno’s elongated nave and façade (1608–12). Gian Lorenzo Bernini later shaped the baldachin over the high altar and the embracing colonnades of St. Peter’s Square.
"I will build a church more beautiful than any yet raised by man — large enough to hold the world, and worthy of the Apostle whose bones rest beneath its stones."
— Paraphrase of Renaissance ambition for New St Peter's (Julius II / Bramante era)
The interior combines papal tombs, mosaic altars, and Michelangelo’s Pietà near the entrance. Beneath the Confessio excavators have mapped the Constantinian and Nero-period necropolis that anchors the church’s origin story. UNESCO covers the basilica within “Vatican City” (1984). Pair with Hagia Sophia and Notre-Dame de Paris for contrasting imperial and Gothic Christian centres.