Most visits to the Vatican City are trouble-free but you should be aware of the global risk of indiscriminate international terrorist attacks, which could be against civilian targets, including places frequented by foreigners.
Vatican City has no administrative divisions.It could be considered an administrative division of Rome, but because it is its own country it is (mostly) administratively independent of Rome.
Vatican City State is a landlocked sovereign city-state whose territory consists of a walled enclave within the city of Rome, the capital city of Italy.