Columbia subject headings:
Obelisks.
Sixtus V, Pope, 1520-1590.
Vatican City. Obelisk.
Harvard subject headings:
Princeton subject headings:
Architecture--Vatican City--Early works to 1800.
Obelisks--Vatican City--Early works to 1800.
Public works--Vatican City--Early works to 1800.
Sixtus V, Pope, 1520-1590.
Vatican City--Buildings, structures, etc.--Early works to 1800.