Avenida de Mayo
Line A is the oldest line of the Buenos Aires Underground. Opened to the public on 1 December 1913, the first underground line in South America, the Southern Hemisphere and the Spanish-speaking world. It made Buenos Aires the 13th city in the world to have an underground transport service. The line stretches 9.8 km from Plaza de Mayo and San Pedrito and runs under all of the Avenida de Mayo and part of the Avenida Rivadavia, and is used by 258,000 people per day.