Columbia subject headings:
Brandenburger Tor (Berlin, Germany)--History.
Gates--Germany--Berlin--History.
Harvard subject headings:
Berlin (Germany)--Politics and government
Brandenburger Tor (Berlin, Germany)
Monuments--Conservation and restoration--Germany--Berlin.
Princeton subject headings:
Brandenburger Tor (Berlin, Germany)--History.
Gates--Germany--Berlin--History.