Columbia subject headings:
Castles--Italy--Puglia.
Fortification--Italy--Puglia.
Historic buildings--Italy--Puglia.
Puglia (Italy)--Description and travel.
Towers--Italy--Puglia.
Harvard subject headings:
Castles--Italy--Puglia.
Fortification--Italy--Puglia.
Puglia (Italy)--Buildings, structures, etc.
Towers--Italy--Puglia.
Princeton subject headings:
Castles--Italy--Puglia.
Fortification--Italy--Puglia.
Historic buildings--Italy--Puglia.
Puglia (Italy)--Description and travel.
Towers--Italy--Puglia.