Puerta del Sol is a famous square in central Madrid, Spain. The name "Puerta del Sol" means "Gate of the Sun" in Spanish. The square has been a central gathering place in Madrid for centuries and is the location of the "Kilometer Zero" marker, which marks the point from which all distances in Spain are measured.

Puerta del Sol is surrounded by historic buildings, including the Royal Post Office, the clock tower, and the old city hall. One of the most notable features of the square is the large clock on the tower of the old city hall, which is used to mark the countdown to New Year's Eve celebrations in Madrid.

Puerta del Sol is also home to several famous statues, including the "Bear and the Strawberry Tree" statue, which is a symbol of Madrid. Visitors to the square can enjoy a variety of shops, cafes, and restaurants, as well as street performers and artists.

Puerta del Sol has played a significant role in Spanish history, serving as a site for political demonstrations and public events. The square was the site of the 1808 revolt against French rule, and has also been the site of many celebrations and festivities throughout the years, including the celebration of Madrid's selection as the host city for the 2020 Olympic Games.