Vatican City

Vatican City, or simply the Vatican, was located in Rome, in Italy. It was the capital of the Catholic Church. (TV: Extremis)

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)

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