The Madrid Metro is a rapid transit system serving the Spanish capital, Madrid. It was inaugurated in 1919 by King Alfonso, with a single line which ran for 3.48 km (2.16 mi) between Puerta del Sol and Cuatro Caminos, with eight stops. The present system has 301 stations on 13 lines plus one branch line, totalling 294 km (183 mi).Map: Javitomad