The Muslim Walls of Madrid, also known as Arab Walls of Madrid, and some vestiges remain, are located in the Spanish city of Madrid. It is probably the oldest building on foot in the city. It was built in the 9th century, during the Muslim domination of the Iberian Peninsula, on a promontory next to Manzanares river. It was part of a fortress around which developed the urban nucleus of Madrid. It was declared an Artistic-Historic Monument in 1954.
The remains of utmost importance, with a more archaeological than artistic interest, are in the Cuesta de la Vega, next to the crypt of the Almudena Cathedral. They were built in the park of Mohamed I, named in reference to Muhammad I of Córdoba, considered the founder of the city.
Along the Calle Mayor street, at the number 83, next to Viaduct that saves the Calle de Segovia, are still standing the ruins of the Tower of Narigües, which probably would have been an albarrana tower, with a separate location of the wall itself, but connected thereto through a wall. Its function was to serve as a knoll.
In the 20th century, some remains were destroyed. The rest existing to the number 12 of the Calle de Bailén were lost with the construction of an apartment block, although some walls were integrated into the building structure, as its bottom. The remodeling of the Plaza de Oriente, completed in 1996 during the term of José María Álvarez del Manzano, meant the discovery and subsequent disappearance of numerous remains. This was not the case of the watchtower known as Tower de los Huesos, whose base is on display in the underground car park of the same plaza.
Between 1999 and 2000, another section was uncovered, about 70 metres (230 ft) long, under the Plaza de la Armería, formed by the main façades of the Royal Palace and Almudena Cathedral. It was excavated during the construction works of the Museum of Royal Collections (unfinished) and may correspond to the Puerta de la Sagra, one of the gates to the walled enclosure.