Vatican City

Vatican City, also known simply as the Vatican and officially known as the Holy See of Vatican City, (TV: Children of Earth: Day Three) was located in Rome, in Italy. It was the capital of the Catholic Church. (TV: Extremis)

History
In 2009, the "Holy See of Vatican City" was among the nations which agreed to let John Frobisher speak on their behalf to the 456. (TV: Children of Earth: Day Three)

From at least 1799 (PROSE: Christmas on a Rational Planet) through the 27th century, (PROSE: De Umbris Idearum) the Vatican accumulated a large number of items they deemed unwise for the general public to know about. The Library of St John the Beheaded stored forbidden texts, the Crow Gallery held living creatures, and the Collection of Necessary Secrets collected non-living items. (PROSE: Christmas on a Rational Planet) In the Shadow World, the Veritas was stored in the Vatican, and the Pope invited the Twelfth Doctor, Bill, and Nardole to read it. (TV: Extremis)

River Song and Helen Sinclair visited the inner chamber of the Vatican in the 1960s. (AUDIO: The Doomsday Chronometer)

In an alternate timeline caused by the time field, the Pandorica, which was guarded by the Lone Centurion, was donated to the Vatican in 1231. (TV: The Big Bang)

There was a floating Vatican City in Europa in the 33rd century. (PROSE: Managra)

In the 46th century, clonodating was banned by the Vatican. (PROSE: Paydirt)

Shadow World
In a simulated world created by the Monks, the Vatican served as a vault for the most dangerous objects on the planet. (TV: Extremis)