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The Buen Retiro Park (Spanish: Parque del Buen Retiro, literally "Park of the Pleasant Retreat"), Retiro Park or simply El Retiro is one of the largest parks of the city of Madrid, Spain. The park belonged to the Spanish Monarchy until the late 19th century, when it became a public park.

The Palacio de Cristal ("Glass Palace") is a conservatory located in Madrid's Buen Retiro Park. It was built in 1887 on the occasion of the Exposition of the Philippines, held in the same year, then a Spanish colonial possession. The architect was Ricardo Velázquez Bosco.The Palacio de Cristal, in the shape of a Greek cross, is made almost entirely of glass set in an iron framework on a brick base, which is decorated with ceramics.

The Fuente del Ángel Caído (Fountain of the Fallen Angel or Monument of the Fallen Angel) is a fountain located in the Buen Retiro Park in Madrid, Spain. The statue that crowns the monument is the masterpiece of Ricardo Bellver who realized it in plaster in 1877 while a 3rd year pensioner in Rome, inspired by verses from Paradise Lost of John Milton (Canto I).

Buen Retiro Palace (Spanish: Palacio del Buen Retiro) in Madrid was a large palace complex designed by the architect Alonso Carbonell (c. 1590–1660) and built on the orders of Philip IV of Spain as a secondary residence and place of recreation (hence its name). It was built in what was then the eastern limits of the city of Madrid.

Palacio de Velázquez, or Velázquez Palace (sometimes referred to as Palacio de Exposiciones) is an exhibition hall located in Buen Retiro Park, Madrid, Spain.Originally known as the Palacio de la Minería, it was built in 1881-3 for the Exposición Nacional de Minería by architect Ricardo Velázquez Bosco (and named after him), engineer Alberto Palacio, and ceramist Daniel Zuloaga.

The Spanish National Observatory (Spanish: Observatorio Astronómico Nacional de España, OAN) is an astronomical observatory with several facilities in the Madrid area.The Observatory has published a yearbook (the Anuario del Observatorio Astronómico de Madrid) since the 19th century.