Palau de la Música Catalana (Palace of Catalan Music) - Barcelona, Spain - a concert hall designed in the Catalan modernista style by the architect Lluís Domènech i Montaner - built between 1905 and 1908 for the Orfeó Català, a choral society founded in
Art Nouveau Tour of Barcelona. This is Casa Batllo, designed by Gaudi. Spain was not drawn into WW I and as such during that time, had prosperity. As as result, there are over 400 Art Nouveau structures in Barcelona.
Catalonia is an autonomous community of Spain and an officially recognized Catalonia comprises four provinces: Barcelona, Girona, Lleida, and Tarragona. The capital and largest city is Barcelona, the second largest city in Spain.