Columbia subject headings:
Harvard subject headings:
Art, Medieval--Europe--Exhibitions.
Basilica di San Pietro in Vaticano--History--Exhibitions.
Christian pilgrims and pilgrimages--Italy--Rome--History--Exhibitions.
Holy Year--History--Exhibitions.
Princeton subject headings:
Basilica di San Pietro in Vaticano--Exhibitions.
Christian art and symbolism--Italy--Rome--Exhibitions.
Christian pilgrims and pilgrimages--Vatican City--Exhibitions.