Puerta del Sol Spanish for ´Gate of the Sun´ is one of the most well known and busiest places in Madrid This is the centre Km 0 of the radial network of Spanish roads The square also contains the famous clock whose bells mark the traditional eating of t. Puerta del Sol Spanish for ´Gate of the Sun´ is one of the most well known and busiest places in Madrid This is the centre Km 0 of the radial network of Spanish roads The square also contains the famous clock whose bells mark the traditional