Columbia subject headings:
Harvard subject headings:
Castles--Germany--Thuringia--History--Exhibitions.
Fortification--Germany--Thuringia--History--Exhibitions.
Siege warfare--Germany--Thuringia--History--Exhibitions.
Princeton subject headings:
Castles--Germany--Thuringia--History--Exhibitions.
Fortification--Germany--Thuringia--History--Exhibitions.
Siege warfare--Germany--Thuringia--History--Exhibitions.