Vatican City
Vatican City has a reasonably well-developed transport network considering its size (consisting mostly of a piazza and walkways). A state that is long and wide, it has a small transportation system with no airports or highways. The only aviation facility in Vatican City is the Vatican City Heliport. Vatican City is one of the few independent countries without an airport, and is served by the airports that serve the city of Rome, Leonardo da Vinci-Fiumicino Airport, and to a lesser extent Ciampino Airport.
Archbasilica of St. John Lateran
When the papacy returned from Avignon and the pope again resided in Rome, the archbasilica and the Lateran Palace were deemed inadequate considering their accumulated damage. The popes resided at the Basilica di Santa Maria in Trastevere and later at the Basilica di Santa Maria Maggiore. Eventually, the Palace of the Vatican was built adjacent to the Basilica of St. Peter, which existed since the time of Emperor Constantine I, and the popes began to reside there. It has remained the official residence of the pope (though Pope Francis unofficially resides elsewhere in the Vatican City).