Parque do Ibirapuera (Ibirapuera Park) occupies an area of 1,6 million square meters and is home to important public buildings, several museums, a planetarium, and Pavilhão Japonês (Japanese Pavilion), with its typical gardens and lakes. There are also running tracks, courts, bike tracks and a large plant nursery. There you find the Bienal building, Ginásio de Esportes (Sports Gymnasium), Museu do Presépio (Crèche Museum), Museu da Aeronáutica e do Folclore (Aeronautic and Folklore Museum), Obelisco in honor of the heroes of 32 (a revolution that took place in 1932) and the monument to Bandeiras (a group of explorers). One of the city's most important green areas, Parque do Ibirapuera was opened in 1954 to celebrate the city's IV Centenário (the city's 400 years).