worked on by Cosimo Lotti, a garden designer who had worked under Bernardo Buontalenti on the layout of the Boboli Gardens for Cosimo I, Grand Duke of Tuscany. Water was a distinguishing trait of the garden from the outset: the great pond, Estanque del Retiro, which served as the setting for mock naval battles and other aquatic displays, the great canal, the narrow channel, the chamfered or bellflower pond, created —along with the chapels— the basic layout of the gardens. Buen Retiro was described as "The world art wonder of the time", probably the last great creation of the Renaissance in Spain. Buen Retiro became the center of Habsburg court life at a time when Spain was the foremost power in the world. During the reigns of Philip IV and Charles II several magnificent plays were performed in the park for the royal family and the court. The gardens were neglected after the death of Philip IV in 1665, but have been restored and changed on many occasions, notably after being opened to the public in 1767 and becoming the property of the municipality in 1868. Philip V (1700–1746) ordered the creation of a parterre, the only French-style garden in the complex. During the reign of Ferdinand VI, Buen Retiro was the setting for magnificent Italian operas. Charles III (1759–1788) saw to the beautification of its perimeter, replacing the old walls with elegant wrought-iron railings. Juan de Villanueva's Astronomical Observatory was built during the reign of Charles IV (1788–1808). The Buen Retiro Palace was used until the era of Charles III. Most of the palace was destroyed during the Peninsular War (1807–1814) with the First French Empire. The reign of Queen Isabella II saw profound changes in the "Retiro". During the queen's minority, the gardens enjoyed a particularly prosperous period, with the planting of shade and fruit trees, and previously unplanted areas like the "Campo Grande", were landscaped as well. The gardens eventually passed to public ownership in 1868, at the time of the overthrow of Queen Isabella. In 1883 it hosted the Exposición Nacional de Minería. 14 ha of the park served as fairgrounds of the 1887 Philippines Exposition, which included a human zoo. El Retiro gradually became the green heart of the city. At the beginning of the 20th century, the Monument to Alfonso XII of Spain was erected next to the pond, designed by architect José Grases