Columbia subject headings:
Castles--France--Pictorial works.
Fortification--France--Pictorial works.
Historic sites--France--Pictorial works.
Military architecture--France--Pictorial works.
Harvard subject headings:
Castles--France--Pictorial works.
Fortification--France--Pictorial works.
Historic sites--France--Pictorial works.
Military architecture--France--Pictorial works.
Princeton subject headings: