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.