King Charles III beautified the city and endeavoured to convert Madrid into one of the great European capitals. He pushed forward the construction of the Prado Museum (originally intended as a Natural Science Museum), the Puerta de Alcalá, the Royal Observatory, the Basilica of San Francisco el Grande, the Casa de Correos in Puerta del Sol, the Real Casa de la Aduana, and the General Hospital (which now houses the Reina Sofia Museum and Royal Conservatory of Music). The Paseo del Prado, surrounded by gardens and decorated with neoclassical statues, is an example of urban planning. The Duke of Berwick ordered the construction of the Liria Palace.