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• The Vatican climate is the same as Rome's; a temperate, Mediterranean climate with mild, rainy winters from September to mid-May and hot, dry summers from May to August. There are some local features, principally mists and dews, caused by the anomalous bulk of St Peter's Basilica, the elevation, the fountains and the size of the large paved square.

• In July 2007, the Vatican agreed to become the first carbon neutral state. They plan to accomplish this by offsetting carbon dioxide emissions with the creation of a Vatican Climate Forest in Hungary.

• The name "Vatican" predates Christianity and comes from the Latin Mons Vaticanus, meaning Vatican Mount. The territory of Vatican City is part of the Mons Vaticanus, and of the adjacent former Vatican Fields. It is in this territory that St. Peter's Basilica, the Apostolic Palace, the Sistine Chapel, and museums were built, along with various other buildings. The area was part of the Roman rione of Borgo until 1929. Being separated from the city, on the west bank of the Tiber river, the area was an outcrop of the city that was protected by being included within the walls of Leo IV (847–55), and later expanded by the current fortification walls, built under Paul III (1534–49), Pius IV (1559–65) and Urban VIII (1623–44).

• When the Lateran Treaty of 1929 that gave the state its present form was being prepared, the boundaries of the proposed territory were influenced by the fact that much of it was all but enclosed by this loop. For some tracts of the frontier, there was no wall, but the line of certain buildings supplied part of the boundary, and for a small part of the frontier a modern wall was constructed.

• The territory includes St. Peter's Square, distinguished from the territory of Italy only by a white line along the limit of the square, where it touches Piazza Pio XII. St. Peter's Square is reached through the Via della Conciliazione which runs from close to the Tiber River to St. Peter's. This grand approach was constructed by Benito Mussolini after the conclusion of the Lateran Treaty.

• According to the Lateran Treaty, certain properties of the Holy See that are located in Italian territory, most notably Castel Gandolfo and the major basilicas, enjoy extraterritorial status similar to that of foreign embassies. These properties, scattered all over Rome and Italy, house essential offices and institutions necessary to the character and mission of the Holy See. Castel Gandolfo and the named basilicas are patrolled internally by police agents of Vatican City State and not by Italian police. St. Peter's Square is ordinarily policed jointly by both.

• Within the territory of Vatican City are the Vatican Gardens (Italian: Giardini Vaticani), which account for more than half of this territory. The gardens, established during the Renaissance and Baroque era, are decorated with fountains and sculptures.

• The gardens cover approximately 23 hectares which is most of the Vatican Hill. The highest point is 60 metres (200 ft) above mean sea level. Stone walls bound the area in the North, South and West.

• The gardens date back to medieval times when orchards and vineyards extended to the north of the Papal Apostolic Palace. In 1279 Pope Nicholas III (Giovanni Gaetano Orsini, 1277–1280) moved his residence back to the Vatican from the Lateran Palace and enclosed this area with walls. He planted an orchard (pomerium), a lawn (pratellum) and a garden (viridarium).

• In this originally uninhabited area (the ager vaticanus) on the opposite side of the Tiber from the city of Rome, Agrippina the Elder (14 BC – 18 October AD 33) drained the hill and environs and built her gardens in the early 1st century AD. Emperor Caligula (31 August AD 12 – 24 January AD 41; r. 37–41) started construction of a circus (AD 40) that was later completed by Nero, the Circus Gaii et Neronis, usually called, simply, the Circus of Nero. In AD 69, the Year of the Four Emperors, when the northern army that brought Aulus Vitellius to power arrived in Rome, "a large proportion camped in the unhealthy districts of the Vatican, which resulted in many deaths among the common soldiery; and the Tiber being close by, the inability of the Gauls and Germans to bear the heat and the consequent greed with which they drank from the stream weakened their bodies, which were already an easy prey to disease".

• The Vatican obelisk was originally taken by Caligula from Heliopolis, Egypt to decorate the spina of his circus and is thus its last visible remnant. This area became the site of martyrdom of many Christians after the Great Fire of Rome in AD 64. Ancient tradition holds that it was in this circus that Saint Peter was crucified upside-down.

• Opposite the circus was a cemetery separated by the Via Cornelia. Funeral monuments and mausoleums and small tombs as well as altars to pagan gods of all kinds of polytheistic religions were constructed lasting until before the construction of the Constantinian Basilica of St. Peter's in the first half of the 4th century. Remains of this ancient necropolis were brought to light sporadically during renovations by various popes throughout the centuries increasing in frequency during the Renaissance until it was systematically excavated by orders of Pope Pius XII from 1939 to 1941.

• In 326, the first church, the Constantinian basilica, was built over the site that early Roman Catholic apologists (from the first century on) as well as noted Italian archaeologists argue was the tomb of Saint Peter, buried in a common cemetery on the spot. From then on the area started to become more populated, but mostly only by dwelling houses connected with the activity of St. Peter's. A palace was constructed near the site of the basilica as early as the 5th century during the pontificate of Pope Symmachus (reigned 498–514).

• Popes in their secular role gradually came to govern neighbouring regions and, through the Papal States, ruled a large portion of the Italian peninsula for more than a thousand years until the mid 19th century, when all of the territory of the Papal States was seized by the newly created Kingdom of Italy. For much of this time the Vatican was not the habitual residence of the Popes, but rather the Lateran Palace, and in recent centuries, the Quirinal Palace, while the residence from 1309–77 was at Avignon in France.

• In 1870, the Pope's holdings were left in an uncertain situation when Rome itself was annexed by the Piedmont-led forces which had united the rest of Italy, after a nominal resistance by the papal forces. Between 1861 and 1929 the status of the Pope was referred to as the "Roman Question". The successive Popes were undisturbed in their palace, and certain prerogatives recognized by the Law of Guarantees, including the right to send and receive ambassadors. But the Popes did not recognise the Italian king's right to rule in Rome, and they refused to leave the Vatican compound until the dispute was resolved in 1929. Other states continued to maintain international recognition of the Holy See as a sovereign entity.

• In practice Italy made no attempt to interfere with the Holy See within the Vatican walls. However, they confiscated church property in many other places, including, perhaps most notably, the Quirinal Palace, formerly the pope's official residence. Pope Pius IX (1846–78), the last ruler of the Papal States, claimed that after Rome was annexed he was a "Prisoner in the Vatican".

• This situation was resolved on 11 February 1929 between the Holy See and the Kingdom of Italy. The Lateran Treaty was signed by Benito Mussolini on behalf of King Victor Emmanuel III and by Cardinal Secretary of State Pietro Gasparri for Pope Pius XI. The treaty, which became effective on 7 June 1929, and the Concordat established the independent State of the Vatican City and granted Roman Catholicism special status in Italy.

• Vatican City pursued a policy of neutrality during World War II, under the leadership of Pope Pius XII. Although the city of Rome was occupied by Germany from 1943 and the Allies from 1944, Vatican City itself was not occupied. One of Pius XII's main diplomatic priorities was to prevent the bombing of Rome; so sensitive was the pontiff that he protested even the British air dropping of pamphlets over Rome, claiming that the few landing within the city-state violated the Vatican's neutrality. Before the American entry into the war, there was little impetus for such a bombing, as the British saw little strategic value in it. After the American entry, the US opposed such a bombing, fearful of offending Catholic members of its military forces, while the British then supported it. Pius XII similarly advocated for the declaration of Rome as an "open city", but this occurred only on August 14, 1943, after Rome had already been bombed twice. Although the Italians consulted the Vatican on the wording of the open city declaration, the impetus for the change had little to do with the Vatican.

• The Pope is ex officio head of state of Vatican City, functions dependent on his primordial function as bishop of the diocese of Rome. The term Holy See refers not to the Vatican state but to the Pope's spiritual and pastoral governance, largely exercised through the Roman Curia. His official title with regard to Vatican City is Sovereign of the State of the Vatican City.

• His principal subordinate government official for Vatican City is the President of the Pontifical Commission for Vatican City State, who since 1952 exercises the functions previously belonging to the Governor of Vatican City. Since 2001, the President of the Pontifical Commission for Vatican City State also has the title of President of the Governorate of the State of Vatican City.

• The Pope resides in the Papal Apartments of the Papal Palace overlooking off Saint Peter's Square. It is here he carries out his business and meets foreign representatives.

• The current Pope is Benedict XVI, born Joseph Alois Ratzinger in Bavaria, Germany. Italian Cardinal Giovanni Lajolo serves as President of the Pontifical Commission for the State of Vatican City. He was appointed by Pope Benedict XVI on 11 September 2006.

• The politics of Vatican City takes place in an absolute elective monarchy, in which the head of the Roman Catholic Church takes power. The Pope exercises principal legislative, executive, and judicial power over the State of Vatican City (an entity distinct from the Holy See), which is a rare case of a non-hereditary monarchy.

• Vatican City is currently the only widely recognised independent state that has not become a member of the UN. The Holy See, which is distinct from Vatican City State, has permanent observer status with all the rights of a full member except for a vote in the UN General Assembly.

• The government of Vatican City has a unique structure. The Pope is the sovereign of the state. Legislative authority is vested in the Pontifical Commission for Vatican City State, a body of cardinals appointed by the Pope for five-year periods. Executive power is in the hands of the President of that commission, assisted by the General Secretary and Deputy General Secretary. The state's foreign relations are entrusted to the Holy See's Secretariat of State and diplomatic service. Nevertheless, the pope has full and absolute executive, legislative and judicial power over Vatican City. He is currently the only absolute monarch in Europe.

• The Cardinal Camerlengo presides over the Apostolic Camera to which is entrusted the administration of the property and the protection of the temporal rights of the Holy See during a papal vacancy. Those of the Vatican State remain under the control of the Pontifical Commission for the State of Vatican City. Acting with three other cardinals chosen by lot every three days, one from each order of cardinals (cardinal bishop, cardinal priest, and cardinal deacon), he in a sense performs during that period the functions of head of state. All the decisions these four cardinals take must be approved by the College of Cardinals as a whole.

• The nobility that was closely associated with the Holy See at the time of the Papal States continued to be associated with the Papal Court after the loss of these territories, generally with merely nominal duties (see Papal Master of the Horse, Prefecture of the Pontifical Household, Hereditary officers of the Roman Curia, Black Nobility). They also formed the ceremonial Noble Guard. In the first decades of the existence of the Vatican City State, executive functions were entrusted to some of them, including that of Delegate for the State of Vatican City (now denominated President of the Commission for Vatican City). But with the motu proprio Pontificalis Domus of 28 March 1968, Pope Paul VI abolished the honorary positions that had continued to exist until then, such as Quartermaster General and Master of the Horse.

• The State of the Vatican City, created in 1929 by the Lateran Pacts, provides the Holy See with a temporal jurisdiction and independence within a small territory. It is distinct from the Holy See. The state can thus be deemed a significant but not essential instrument of the Holy See. The Holy See itself has existed continuously as a juridical entity since Roman Imperial times and has been internationally recognised as a powerful and independent sovereign entity since late antiquity to the present, without interruption even at times when it was deprived of territory (e.g. 1870 to 1929). The Holy See has the oldest active continuous diplomatic service in the world, dating back to at least AD 325 with its legation to the Council of Nicea. Ambassadors are accredited to the Holy See, never to the Vatican City State.

• The Palatine Guard and the Noble Guard were disbanded by Pope Paul VI in 1970. While the first body was founded as a militia at the service of the Papal States, its functions within the Vatican State, like those of the Noble Guard, were merely ceremonial.

• The Corpo della Gendarmeria acts as a police force. Its full name is Corpo della Gendarmeria dello Stato della Città del Vaticano (which means "Gendarmerie Corps of the Vatican City State"), although it is sometimes referred to as the Vigilanza, as a shortening of an earlier name. The Gendarmeria is responsible for public order, law enforcement, crowd and traffic control, and criminal investigations in Vatican City.

• The military defence of the Vatican City is provided by Italy and its armed forces, given the fact that Vatican City is an enclave within the Italian Republic. Vatican City has no armed force of its own, the Swiss Guard being a corps responsible for the security of the Pope. (See: Military of Vatican City)

• Vatican City State is a recognised national territory under international law, but it is the Holy See that conducts diplomatic relations on its behalf, in addition to the Holy See's own diplomacy, entering into international agreements in its regard. The Vatican City State thus has no diplomatic service of its own. Because of space limitations, Vatican City is one of the few countries in the world that is unable to host embassies.

• Foreign embassies to the Holy See are located in the city of Rome; only during the Second World War were the staff of some embassies accredited to the Holy See given what hospitality was possible within the narrow confines of Vatican City—embassies such as that of the United Kingdom while Rome was held by the Axis Powers and Germany's when the Allies controlled Rome.

• The size of Vatican City is thus unrelated to the large global reach exercised by the Holy See as an entity quite distinct from the state.

• However, Vatican City State itself participates in some international organizations whose functions relate to the state as a geographical entity, distinct from the non-territorial legal persona of the Holy See.

• These organizations are much less numerous than those in which the Holy See participates either as a member or with observer status.

• The Vatican City State budget includes the Vatican museums and post office and is supported financially by the sale of stamps, coins, medals and tourist mementos; by fees for admission to museums; and by publications sales. The incomes and living standards of lay workers are comparable to those of counterparts who work in the city of Rome. Other industries include printing, the production of mosaics, and the manufacture of staff uniforms.

• The Vatican also conducts worldwide financial activities, having its own bank, Istituto per le Opere di Religione (also known as the Vatican Bank, and with the acronym IOR). This bank has an ATM with instructions in Latin, possibly the only such ATM in the world.

• Vatican City issues its own coins. It has used the euro as its currency since 1 January 1999, owing to a special agreement with the European Union (council decision 1999/98/CE). Euro coins and notes were introduced in 1 January 2002—the Vatican does not issue euro banknotes. Issuance of euro-denominated coins is strictly limited by treaty, though somewhat more than usual is allowed in a year in which there is a change in the papacy. Because of their rarity, Vatican euro coins are highly sought by collectors. Until the adoption of the Euro, Vatican coinage and stamps were denominated in their own Vatican lira currency, which was on par with the Italian lira.

• The Vatican City State, which employs nearly 2000 people, ran a deficit in 2008 of over 15 million euros, but in 2007 had a surplus of 6.7 million euros.

• Almost all of Vatican City's 826 (2009 est.) citizens either live inside the Vatican's walls or serve in the Holy See's diplomatic service in embassies (called "nunciatures"; a papal ambassador is a "nuncio") around the world. The Vatican citizenry consists almost entirely of two groups: clergy, most of whom work in the service of the Holy See, and a very few as officials of the state; and the Swiss Guard. Most of the 3,000 lay workers who comprise the majority of the Vatican workforce reside outside the Vatican and are citizens of Italy, while a few are citizens of other nations. As a result, all of the City's actual citizens are Catholic as are all the places of worship.

• Vatican City has no set official language. Unlike the Holy See, which most often uses Latin for the authoritative version of its official documents, Vatican City uses Italian in its legislation and official communications. Italian is also the everyday language used by most of those who work in the state. In the Swiss Guard, German is the language used for giving commands, but the individual guards take their oath of loyalty in their own languages, German, French, Romansh or Italian. Vatican City's official website languages are Italian, English, French, German, and Spanish. (This site should not be confused with that of the Holy See, which uses all these languages, along with Portuguese, with Latin since 9 May 2008 and Chinese since 18 March 2009.)

• Vatican City is home to some of the most famous art in the world. St. Peter's Basilica, whose successive architects include Bramante, Michelangelo, Giacomo della Porta, Maderno and Bernini is a renowned work of Renaissance architecture. The Sistine Chapel is famous for its frescos, which include works by Perugino, Domenico Ghirlandaio and Botticelli as well as the ceiling and Last Judgement by Michelangelo. Artists who decorated the interiors of the Vatican include Raphael and Fra Angelico.

• The Vatican Library and the collections of the Vatican Museums are of the highest historical, scientific and cultural importance. In 1984, the Vatican was added by UNESCO to the List of World Heritage Sites; it is the only one to consist of an entire state. Furthermore, it is the only site to date registered with the UNESCO as a centre containing monuments in the "International Register of Cultural Property under Special Protection" according to the 1954 Hague Convention for the Protection of Cultural Property in the Event of Armed Conflict.

• Pope John XXIII was the first Pope to make use of this railway, and Pope John Paul II used it as well, albeit very rarely. The railway is mainly used to transport freight. As Vatican City has no airports (it is one of the few independent states in the world without one, except for the aforementioned heliport), it is served by the airports that serve the city of Rome, within which the Vatican is located, namely: Leonardo da Vinci-Fiumicino Airport and to a lesser extent, Ciampino Airport, which both serve as the departure gateway for the Pope's international visits.

• In accordance with Article 22 of the 1929 Lateran Treaty between the Holy See and Italy, the Italian government, when requested by the Holy See, handles the prosecution and detention of criminal suspects, at the expense of the Vatican. Capital punishment was envisaged in the legislation adopted in 1929 on the basis of Italian law, but the Vatican state never exercised it and abolished it in 1969.