Columbia subject headings:
Harvard subject headings:
Castles--Juvenile literature
Church buildings--Juvenile literature.
England--Description and travel--Juvenile literature.
Europe--Description and travel
Europe--Description and travel--Juvenile literature.
Italy--Description and travel--Juvenile literature.
Natural history--Juvenile literature
Rivers--Juvenile literature
Rome--Description and travel--Juvenile literature.
Voyages and travels--Juvenile literature
Princeton subject headings:
Europe--Description and travel.