This cover from Spain depict a 0,24€ UNESCO stamp celebrating the
Palau de la Musica and Hospital de Sant Pau in Barcelone. Both buildings were constructed in the early 20th century and designed by Lluís Domènech i Montaner in the modernist Art Nouveau movement that was very popular in Barcelona in that period. The two buildings are Montaner's most famous works and were inscribed as a UNESCO World Heritage Site in 1997.
