Which landmark's clock chimes are used for Spain's nationally watched New Year's Eve countdown?

The Puerta del Sol clock is used for Spain's nationally watched New Year's Eve countdown.

Puerta del Sol is a major public square in central Madrid. Its clock tower, mounted on the former post-office building now associated with the regional government, provides the chimes that accompany Spain's famous twelve-grape tradition. Television coverage brings the square's countdown to viewers throughout Spain and to Spanish-speaking audiences elsewhere.

The clock was a gift from Queen Isabella II and was installed in the nineteenth century. Its New Year's Eve role made the square one of the country's most recognizable symbols of the annual changeover.

The clock's chimes are sometimes confused with the visible “quarters” that precede the twelve main strokes. Participants must wait for the actual twelve chimes before eating the grapes; starting during the preliminary sounds can make the tradition difficult to follow.