Almudena Cathedral
Almudena Cathedral sits directly opposite the Royal Palace and is Madrid's main cathedral, completed only in 1993. Free to enter (donations encouraged).
Monument in Madrid
The Santiago Bernabeu is the home of Real Madrid, one of the most successful football clubs in the world. Stadium tours are paid. The stadium is currently undergoing major renovation (retractable roof, 360-degree screen). Budget travelers check the current tour availability, photograph the stadium from outside (free), and attend a match if one coincides with their visit (cheapest tickets for league matches start at affordable prices if bought early). For many visitors, the Bernabeu is as important as the Prado.
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Nearby
Other places worth the walk, and what each one costs.
Almudena Cathedral sits directly opposite the Royal Palace and is Madrid's main cathedral, completed only in 1993. Free to enter (donations encouraged).
El Rastro is Madrid's Sunday morning flea market, sprawling through the streets of La Latina neighborhood from Plaza de Cascorro downhill to the Embajadores roundabout. Free to browse.
Gran Via is Madrid's most famous boulevard, a wide avenue of early 20th-century buildings, theatres, shops, and neon signs running from Calle de Alcala to Plaza de Espana. Free to walk.
La Latina is the neighborhood south of Plaza Mayor where Madrilenos go for Sunday tapas after the El Rastro market. Free to walk.
The Mercado de San Miguel is a glass and iron market hall next to the Plaza Mayor with gourmet food stalls selling tapas, wine, oysters, pastries, and iberico ham. Free to enter.
The Parque de El Capricho is an 18th-century garden in the Alameda de Osuna district, the only garden in Madrid with three styles (French, Italian, English) in one park. Free.
Working out what Madrid costs?
The whole of Madrid