What landmark clock leads Spain's famous New Year's Eve grape-eating tradition?

The Puerta del Sol clock leads Spain's famous New Year's Eve grape-eating tradition.

Puerta del Sol is a major square in central Madrid, and its clock tower supplies the midnight chimes heard across Spain through television and radio broadcasts. Revelers watch the clock and eat one grape at each of its twelve strokes.

The clock is mounted on the former post office building, now the headquarters of the Community of Madrid. The building's tower and clock became an important national timekeeping symbol, especially during the televised New Year's Eve ritual.

Puerta del Sol is also associated with the Kilometre Zero plaque, from which Spain's radial roads are traditionally measured. That geographic role is separate from the clock's festive role, but both help explain why the square is recognized far beyond Madrid.