Parque Centenario is an extensive public park in the Caballito district of Buenos Aires, Argentina.OverviewPresiding over a rapidly expanding city, the Buenos Aires City Council in 1908 approved the purchase of a 10 hectare plot belonging to Parmenio Piñero, a local brickmaker, for the purpose of a creating a "Westside Park" . The project was entrusted to the City Parks Administrator, the renowned French Argentine urbanist Charles Thays, who completed the project in time for the 1910 centennial of the May Revolution . Rerouting two streets, Thays created a circular green space anchored by fountain in the middle. The outer sections of the park were planned for residential development, though these plans were later rescinded.The outermost lots were made available to a number of cultural and scientific institutions, notably the Louis Pasteur Institute, the Marie Curie Oncological Institute, the Bernardino Rivadavia Natural Sciences Museum, which relocated there from its original building in 1937, and the Argentine Friends of Astronomy Association, who opened their observatory at the park in 1944; the Leloir Institute - one of the nation's leading biotechnology research centers - and the Central Naval Hospital were both opened during the early 1980s in lots facing the park. President Juan Perón had the central fountain replaced in 1951 by an amphitheatre with a capacity for 20,000 spectators, a structure lost to arson in 1959. Mayor Osvaldo Cacciatore had a shallow lake built over 2000 m² of the central section of the park during the late 1970s, later populated with ducks, swans and other waterfowl. The mile-long perimeter became a popular joggers' route and a number of important public institutions had been opened along the park's surroundings.