- The Puerta del Sol (Sun Gate) is the center of Madrid, both literally and figuratively. The historic square is the heart of the downtown shopping district and the site of Spain's most famous New Year's celebrations. This is where the Spanish ball drops come December 31 as Spaniards celebrate with grapes and Spanish sparkling wine (cava). The Puerta del Sol is also the site of Kilometer Zero, the point from which all distances in Spain and the country's road network are measured, which is commemorated with a plaque.
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