Columbia subject headings:
Art--Vatican City.
Grotte vaticane (Basilica di San Pietro in Vaticano)
Tombs--Vatican City.
Vatican City--Buildings, structures, etc.
Harvard subject headings:
Christian art and symbolism--Vatican City.
Grotte vaticane (Basilica di San Pietro in Vaticano)
Popes--Tombs--Vatican City.
Sepulchral monuments--Vatican City.
Tombs--Vatican City
Vatican City--Buildings, structures, etc.
Princeton subject headings:
Art--Vatican City.
Grotte vaticane (Basilica di San Pietro in Vaticano)
Tombs--Vatican City.
Vatican City--Buildings, structures, etc.