Holy See: The ecclesiastical jurisdiction of the Catholic Church in Rome, of which the Pope is the head. It serves as the central point of authority and decision-making for the Catholic Church worldwide.
Apostolic Palace: The official residence of the Pope, located within the Vatican City. It serves as the administrative center of the Catholic Church and houses the Pope's offices, as well as various museums and libraries.
St. Peter's Basilica:The largest church in the world, located in Vatican City. It is the burial site of St. Peter and a major pilgrimage destination for Catholics, as well as a renowned work of Renaissance architecture.