The Puerta del Sol is a central square in Madrid known for its famous clock and tradition of eating grapes on New Year's Eve. The Plaza Mayor is another important central square built during the Habsburg period surrounded by balconied buildings. The Parque del Retiro was originally the royal gardens but is now an urban park in the city center popular for its rose garden, museum, and performances on weekends. La Puerta de Alcalá is a neoclassical monument near the entrance to Parque del Retiro that originally marked the road from Madrid to the town of Alcalá de Henares. El Museo del Prado is Spain's main national art museum located in central Madrid and home to one of the