Avenida del Libertador is one of the principal thoroughfares in Buenos Aires, Argentina, and in points north, extending 25 km (16 mi) from the Retiro District of Buenos Aires to the northern suburb of San Fernando.
Avenida Leandro Alem at its northern end becomes Libertador Avenue at the southeast corner of San Martín Plaza. Continuing northwards along the Retiro district, it passes by the important Retiro railway terminal and in parallel to the Mitre rail line. Past the Railway Museum, it travels under the Illia Freeway overpass and through the intersection with the massive Ninth of July Avenue. Entering the Recoleta district, the avenue affords a view of Alvear Plaza and the Recoleta Cultural Center before a fork leads to Figueroa Alcorta Avenue, a parallel throroughfare opened in 1910.
The National Museum of Fine Arts is located at this junction. Its Palermo district stretch takes the avenue past the Argentine Automobile Club, the National Museum of Decorative Arts, the Buenos Aires Japanese Gardens, Tres de Febrero Park, and the Palermo Hippodrome. Its route along both these neighborhoods is surrounded by some of the most valuable residential real estate in Buenos Aires.
A tunnel opened in 1971 takes the avenue past the Municipal Golf Course and into the Belgrano district. In Núñez, it passes by the infamous Navy Mechanics School, which housed the most important of the 340 detention centers operated by Argentina's last dictatorship in the late 1970s. The ESMA is today the National Museum of Remembrance. An underpass then leads into the northern suburb of Vicente López, beginning the avenue's 15 km (9 mi) stretch in Buenos Aires Province.
The scenery of high rises and shopping areas there and in neighboring Olivos gradually blends into leafy San Isidro, passing by the Neogothic Cathedral of San Isidro. A detour via Primera Junta Avenue continues the interrupted thoroughfare into San Fernando until its city limit with the Paraná Delta city of Tigre, where it ends past a bridge over one of the area's numerous canals.