The Vatican City is an ecclesiastical or sacerdotal-monarchical state (a type of theocracy) ruled by the pope who is the bishop of Rome and head of the Roman Catholic Church. The highest state functionaries are all Catholic clergy of various national origins. Since the return of the Popes from Avignon in 1377, they have generally resided atthe Apostolic Palace within what is now Vatican City, although at times residing instead in the Quirinal Palace in Rome or elsewhere.
Within the Vatican City are religious and cultural sites such as St. Peter’s Basilica, the Sistine Chapel and the Vatican Museums. They feature some of the world’s most famous paintings and sculptures. The unique economy of Vatican City is supported financially by the sale of postage stamps and souvenirs, fees for admission to museums, and sales of publications.