Plaza de la Republica

One of Buenos Aires’s most famous landmarks, the Obelisco (Obelisk), is located in the center of Plaza de la Republica. Erected in 1936 to commemorate the first (and ultimately unsuccessful) founding of Buenos Aires by Pedro de Mendoza on its 400th anniversary, the monument stands in the center of Avenida 9 de Julio where it intersects Corrientes. 
The obelisk, designed by Argentine architect Alberto Prebisch, is famously visible from Plaza de Mayo. When Porteños have something to celebrate, particularly a significant soccer victory, flag-waving fans flood the plaza surrounding the monument. 
Before the obelisk went up, Plaza de la Republica was the site of the Church of Saint Nicholas, built on the spot where the flag of Argentina was first flown in 1812 after gaining independence from Spain.

Practical Info

Metro stations Carlos Pellegrini, 9 de Julio and Diagonal Norte connect beneath Plaza de la Republica, making it easy to get to from almost anywhere in the city.