The post office headquarters was built in an eclectic style that displays Gothic, Romanesque and Renaissance features with a pinch of French detail, American sky-scraper and Spanish Modernism. The result is magical. The Postal and Telegraphic Museum is located inside and describes the development of the Spanish communication system starting with the 18th-century postal service and ending with today's sophisticated reality. There are sections showing the evolution of telegraphy, telephones and new technology as well as historical examples of postmen's transport and equipment and a model of the Hispasat satellite. The collection of Spanish and foreign stamps dating from 1850 is magnificent. Admission: free. Guided visits are available for school groups and clubs.