All year long
The Puerta del Sol ("Gate of the Sun") is the nerve centre of the Spanish capital, abuzz with public transport, taxis, tourism, shops, bars and restaurants. This large, sprawling square is a bustling crossroads between a number of shopping streets. It is here that you will find the Casa de Correos clock tower.
The inhabitants of Madrid traditionally gather under the clock face to see in the new year on New Year's Eve. The tradition is that everyone should eat one grape for each strike of the clock, for a prosperous year to come. So if you are in Madrid on December 31st, make sure you have some grapes with you!