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Vatican City (Città del Vaticano) may be the smallest sovereign nation-state in the world, but it's a religious and cultural superpower. Home to some of the world’s greatest artistic and architectural marvels—namely St. Peter’s Basilica, St. Peter’s Square, the Sistine Chapel, and the Vatican Museums—it's located wholly within the confines of Rome, covers 110 acres (44 hectares), and has an official population of about 800.