The Vatican itself refers to the building as the Palace of Sixtus V in honor of Pope Sixtus V . The building contains the Papal Apartments , various government offices of the Catholic Church and the Holy See , private and public chapels , Vatican Museums and the Vatican library , including the Borgia Apartment now used to house artworks .
The palace is a complex of buildings , with the Papal Apartment , the Catholic Church 's government offices , a handful of chapels , the Vatican Museum and the Vatican library .