9St. Peter’s Basilica, Vatican City
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St. Peter’s Basilica is one of the holiest sites in Christianity and an architectural marvel of the Renaissance. Designed by renowned architects including Michelangelo, Bernini, and Bramante, it features an awe-inspiring dome that dominates the skyline of Vatican City. Inside, the basilica is adorned with priceless artworks, including Michelangelo’s Pietà, and the opulent Baldacchino over the papal altar, making it a pilgrimage site for millions.