Fodor's Expert Review Casa de la Papallona

This extraordinary apartment house crowned with an enormous yellow butterfly (papallona) made of trencadís (broken ceramic chips used by the Modernistes to add color to curved surfaces) was built in 1912 by Josep Graner i Prat. Next to Plaça de Espanya, directly overlooking the Arenes de Barcelona (the former bullring, now a multilevel shopping mall), the building displays lines of a routine, late-19th-century design—that is, until you reach the top of the facade.