Columbia subject headings:
Architecture, Modern--19th century.
Architecture, Modern--20th century.
Architecture--Spain--Barcelona.
Gaudí, Antoni, 1852-1926.
Harvard subject headings:
Architecture, Modern--19th century
Architecture, Modern--21st century
Architecture--Spain--Barcelona.
Gaudí, Antoni, 1852-1926
Princeton subject headings:
Architecture, Modern--19th century.
Architecture, Modern--20th century.
Architecture--Spain--Barcelona.
Gaudí, Antoni, 1852-1926.