in which country is this in?
Italy
Vatican City
Vatican City (), officially the Vatican City State (; ), is the Holy See's independent city state, an enclave within Rome, Italy.
what was the structure of the roman catholic church based on UNANSWERABLE who is the head of this church? Pope do they have a holy city? Yes, Vatican City
wiki:19633058
Vatican City [SEP] Introduction
Vatican City (), officially the Vatican City State (; ), is the Holy See's independent city state, an enclave within Rome, Italy. The Vatican City State, also known as The Vatican, became independent from Italy with the Lateran Treaty (1929), and it is a distinct territory under "full ownership, exclusive dominion, and sovereign authority and jurisdiction" of the Holy See, itself a sovereign entity of international law, which maintains the city state's temporal, diplomatic, and spiritual independence. With an area of and a population of about 825, it is the smallest sovereign state in the world by both area and population.