Columbia subject headings:
Ringstrasse (Vienna, Austria)
Streets--Austria--Vienna.
Vienna (Austria)--Social life and customs.
Harvard subject headings:
Princeton subject headings:
Architecture, Modern--18th century.
Architecture--Europe.
Architecture--Vienna--Austria.
City planning--Europe--History--18th century.
Ringstrasse (Vienna, Austria)
Streets--Austria--Vienna.
Vienna (Austria)--Buildings, structures, etc.