These are two of the finest contributions to Barcelona's architecture by the Catalan art nouveau architect Lluís Domènech i Montaner. The Palau de la Música Catalana is an exuberant steel-framed structure full of light and space, and decorated by many of the leading designers of the day. The Hospital de Sant Pau is equally bold in its design and decoration, while at the same time perfectly adapted to the needs of the sick.
Source: http://whc.unesco.org/sites/804.htm
These works by Antonio Gaudí (1852–1926) may be seen as truly universal in view of the diverse cultural sources that inspired them. They represent an eclectic as well as a very personal style which was given free reign not only in the field of architecture but also in gardens, sculpture and all forms of decorative art.
Source: http://whc.unesco.org/sites/320.htm