#monserrat

Buenos Aires - Retiro: Estación Gral. San Martín  Via Flickr: The Subterráneo de Buenos Aires (Bueneos Aires Metro), known locally as Subte, first opened in 1913. It was the first mass-transit system in South America, the Southern Hemisphere and the entire Spanish-speaking world. The network expanded rapidly during the early decades of the 20th century, but the pace of expansion fell sharply after the Second World War.