Vatican City
From Tardis Wiki, the free Doctor Who reference
The Vatican was the central governing body of the Catholic Church. 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. (DW: The Big Bang)
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. (TW: Children of Earth: Day Three)