Parque Centenario, Municipal park in Caballito, Buenos Aires, Argentina.

Parque Centenario is a 10-hectare public park in Caballito, Buenos Aires, laid out by Charles Thays as a circle around a central lake of murky green water. A sloping embankment of light gray and tan stone blocks descends to the water, and a flat stone walkway bordered by evenly spaced dark posts runs along the far edge. A low pale building with a dark roof stands behind the lake, and four white ducks rest on the embankment.

The city council purchased the land from a brickmaker in 1908 and converted it into a park that opened in 1910 to mark the centennial of Argentine independence. Later, the natural sciences museum and an observatory were built along the edge and remain there today.

The name marks the 1910 centennial of the May Revolution. A book and magazine fair runs all week, and on weekends a temporary fair sells crafts and second-hand objects. The amphitheatre at Lillo and Marechal avenues stages free summer shows, and the lake's biological island shelters ducks, swans and turtles.

Access is through several entrances reachable from bus stops and a subway station, and the grounds are open daily from 6:00 AM to 10:30 PM. The circular track and paths are available for walkers, runners, and cyclists, with shaded spots under trees for resting.

The tipa trees come from northern Argentina and drop yellow blossoms in spring that cover the ground. The lake hosts turtles alongside the ducks and swans, which can be spotted from the shore.