 It occupies an elevated position in the apse of the Basilica, supported symbolically by the Doctors of the Church and enlightened symbolically by the Holy Spirit.As one of the constituent structures of the historically and architecturally significant Vatican City, St. Peter's Basilica was inscribed as a UNESCO World Heritage Site in 1984 under criteria (i), (ii), (iv), and (vi).With an exterior area of , an interior area of , St. Peter's Basilica is the largest Christian church building in the world by the two latter metrics and the second largest by the first .