The Palacio Cibeles in Madrid is a famous building located in the Plaza de Cibeles. It was built in the early 20th century and is considered one of the most iconic examples of Belle Époque architecture in Madrid. The building originally housed the headquarters of the Central Post Office, but has since been converted into the town hall. The Palacio Cibeles is also known for its panoramic terrace offering magnificent views of Madrid, as well as the Ballroom and the Hall of Columns which host important social events.