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"The Puerta de Alcalá ("Alcalá Gate") is a Neo-classical monument in the Plaza de la Independencia ("Independence Square") in Madrid, Spain. It stands near the city center and several meters away from the main entrance to the Parque del Buen Retiro. The square is bisected by Alcalá Street, although the street itself doesn't cross through the monument, and it is the origin of the Alfonso XII, Serrano and Olózaga streets. Its name originates from the old path from Madrid to the nearby town of Alcalá de Henares.
Madrid in the late 18th century, still remained a somewhat drab villa in appearance, surrounded by medieval walls. Around the year 1774, king Charles III commissioned Francesco Sabatini to construct a monumental gate in the city wall through which an expanded road to the city of Alcalá was to pass, replacing an older, smaller, gate which stood nearby. It was inaugurated in 1778." In: Wikipedia