Puerta is located in the very heart of Madrid. It serves as the kilometre zero from which all radial roads in Spain are measured. This is demonstrated by a plaque on the floor of the square, marking the exact point of Km.0. This was established in 1857, setting five major radial roads, clockwise: N-1 (Northern Road) to Irun, border town with France, via Burgos, starting from Calle Montera and continuing through Calle de Fuencarral and Calle de Bravo Murillo N-2 (Northeastern Road) to La Jonquera, border town with France, via Zaragoza and Barcelona, starting from Calle de Alcalá N-3 (Eastern Road) to Valencia, starting from Carrera de San Jerónimo, where the Congress of Deputies is located, and continuing through Paseo del Prado N-4 (Southern Road) to Córdoba, Seville and Cádiz, starting from Calle Carretas, Calle Concepción Jerónima and Calle de Toledo N-5 (Southwestern Road) to Badajoz, border town with Portugal, starting from Calle Mayor In 1939, in the aftermath of the Spanish Civil War, military dictator Francisco Franco added a sixth major radial road connecting Madrid and his homeland Galicia. N-6 (Nortwestern Road) to A Coruña, starting from Calle Preciados, continuing through Gran Vía and Calle de la Princesa The old plaque was replaced in 2009, as it had become faded after years of foot traffic. It is also the reference for street numbers in Madrid, which begin at the street-end that is closest to Puerta del Sol. Immediately to the southwest lies the Plaza Mayor; the Palacio Real, the official home of the Royal Family, is further west. Parliament and the museum district are to the east and the train station Atocha is to the southeast. Under the square lies a public transport hub served by lines 1, 2 and 3 of the Madrid Metro. A commuter service was inaugurated on 27 June 2009, four years behind schedule. The lateness of the construction was in part due to the discovery of the remains of the Church of Our Lady of Good Success during the excavation of the main chamber. The new station connects the Puerta to Madrid's commuter rail system and, by extension, to Spain's railroads via direct connections to Atocha and Chamartín railway stations . The square connects several commercial and recreational areas together, and thus both it and the surrounding streets consist mainly of shopping establishments catering to locals and tourists alike, like the several El Corte