Spain, a country on the Iberian Peninsula of Europe, includes 17 autonomous regions with diverse geographical and cultural characteristics. In Madrid, its capital, is the Royal Palace and the Prado Museum, which houses works by European masters. Segovia has a medieval castle (the Alcázar) and an intact Roman aqueduct. The capital of Catalonia, Barcelona, is characterized by the extravagant modernist works of Antoni Gaudí, such as the Sagrada Familia temple.