Muslim Walls of Madrid Muslim Walls of Madrid The Muslim Walls of Madrid, also known as theArab Walls of Madrid, of which some vestiges remain, are located in the Spanish city of Madrid. They are probably the oldest construction extant in the city. They were built in the 9th century, during the Muslim domination of the Iberian Peninsula, on a promontory next to Manzanares river. They were part of a fortress around which developed the urban nucleus of Madrid. They were declared an Artistic-Historic Monument in 1954. The remains of utmost importance, with more archaeological than artistic interest, are in the Cuesta de la
Madrid Metro being postponed and canceled. Unlike normal Spanish road and rail traffic, which use right hand drive, Madrid Metro trains use left-hand running on all lines because traffic in Madrid drove on the left until 1924, well after the Madrid Metro started operation. The Madrid Metro operates every day from 6:00 am until 1:30 am. A light rail system feeding the metro opened in 2007 called Metro Ligero ("light metro"). The Cercanías system works in conjunction with the metro servicing commuter train services to and across the city. Some underground stations are large enough to hold public events, such as the