Columbia subject headings:
Architecture, Gothic--Europe.
Architecture, Gothic--Turkey.
Architecture, Romanesque--Europe.
Architecture, Romanesque--Turkey.
Church architecture--Europe.
Church architecture--Turkey.
Harvard subject headings:
Architecture, Early Christian.
Architecture, Romanesque
Church architecture--Europe.
Galleries (Architecture)
Princeton subject headings:
Architecture, Early Christian.
Architecture, Romanesque.
Church architecture--Europe.
Galleries (Architecture)