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Inaugurated in 1919, the Palacio de Cibeles stands as an architectural marvel showcasing Neoclassical design. Once the city's main post office, it now serves as Madrid's City Hall and a cultural center. Don’t miss the spectacular Glass Gallery and the stunning views from the Mirador, the observation deck where you can see the city's skyline from above.
5. Atocha Train Station
Atocha Train Station is not just a transportation hub but an attraction in itself. With its mid-19th-century architecture, the station features a remarkable transformation that includes the Greenhouse Atocha, a botanical garden filled with tropical plants. Even if you're not traveling, the lush greenery makes for a relaxing escape within the station.