Royal House of the Post Office

The Royal House of the Post Office, located in Puerta del Sol, Madrid, is an 18th-century architectural gem originally built for the postal service. Today, it serves as the office of the President of the Community of Madrid. The building features a historic clock tower, inaugurated in 1866, which plays a central role in Spain's New Year celebrations. Notably, it also marks the kilometer 0 for Madrid's streets, making it a significant landmark for both tourists and researchers interested in Spanish history and culture.