Campo Volantin Footbridge, by Santiago Calatrava, at Bilbao, Spain, 1990 to 1997.

Casa Batllo, by Antoni Gaudi, at Barcelona, Spain, 1905 to 1907.

Casa Mila, by Antoni Gaudi, at Barcelona, Spain, 1905 to 1910.

Cathedral of San Salvador, by unknown, at Avila, Spain, 1091.

Colonia Guell, by Antoni Gaudi, at near Barcelona, Spain, 1898 , 1908 to 1915.

Guggenheim Museum Bilbao, by Frank Gehry, at Bilbao, Spain, 1997.

Palace of Charles V, by Pedro Machuca, at Granada, Spain, 1527 to 1568.

Park Guell, by Antoni Gaudi, at Montana Pelada, Barcelona, Spain, 1900 to 1914.

Sagrada Familia, by Antoni Gaudi, at Barcelona, Spain, 1882 to 1926.

San Miguel, by unknown, at Escalada, near Leon, Spain, 913.

Segovia Cathedral, by Juan Gil de Hontanon, at Segovia, Spain, 1522 to 1577.

Seville Cathedral, by unknown, at Seville, Spain, 1402 to 1520.

Seville Cathedral, by unknown, at Seville, Spain, 1402 to 1520.

The Alcazar, by unknown, at Segovia, near Madrid, Spain, 1000 or 1410 to 1455.

The Alhambra, by unknown, at Granada, Spain, 1338 to 1390.

The Escorial, by Juan Bautista de Toledo, Juan de Herrera, at near Madrid, Spain, 1562 to 1584.

The Library, Escorial, by unknown, at near Madrid, Spain, 1567.

The Thau School, by Martorell/Bohigas/Mackay, at Barcelona, Spain, 1972 to 1974.