Argentina
The city's beautiful sprawling green lung, 350 acres of trees and lakes created by a 19th-century French landscape artist. Visit the zoo, the botanical gardens or the planetarium. The city government provides free outdoor gym classes while others jog, skate, cycle, play soccer or simply soak in the sun.
Natural History Museum with a good collection of shells, dinosaurs and gigantic armadillos. The museum was built in the early 1900s and, fortunately, has not changed much. Its long, dark hallways and high ceilings make for a fun and sometimes spooky visit. At US$2 a person, it's hard to beat.
The Museum is located by Parque Centenario (the park has undoubtedly seen better days), which hosts a crafts fair every weekend, and where locals nowadays try their luck at selling goods to stretch their incomes to the end of the month.
Basically it's a landfill just behind Puerto Madera (three blocks behind, going away from the city and towards the Rio de la Plata). It's been a landfill for many years now and giving various plants, trees and lots of different animals the chance to grow there. If you want to go for a quiet walk, away from the hussle and bustle of the city, this is the best place to go. It's got water and many different species of butterflies and plants, lizards and birds. It's probably the biggest green space I know of in Buenos Aires that you don't have to walk too far to get to.
Avenida Corrientes, follow the avenue down to Luna Park then on to Puerto Madera, and just keep walking - you can't miss it. There are two entrances at both ends each entrance is about 2km apart and then you can enter, absolutely free.
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