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The Holy See - Vatican
Vatican City - Wikipedia
Vatican City | History, Map, Flag, Location, Population, & Facts
Vatican Museums – Official Website - Musei Vaticani
Vatican City - HISTORY
Vatican City - UNESCO World Heritage Centre
St. Peter’s Basilica | History, Architects, Relics, Art, & Facts
Holy See (Vatican City) - The World Factbook
Portal:Vatican City - Wikipedia
Vatican City summary | Britannica