One of Brazil's best children's museums, Catavento offers fun, hands-on science experiments as well as interesting natural history exhibits for children ages 4 to 16. Colorful displays full of photos, videos, sounds, and props made to be touched teach visitors about the universe, planet Earth, Brazilian biomes and fauna, the human body, and much more. The detailed descriptions are only in Portuguese, but many of the exhibits are self-explanatory, and even adults without a science background can help children understand the displays and participate in the experiments. The most popular gallery is Engenho (Ingenuity), packed with dozens of hands-on science experiments that illustrate concepts such as electricity, magnetism, balance, gravity, speed, optical illusions, light, and much more. There's also a playroom with toys and activities for children ages 3 to 7, as well as outdoor activities, such as a train and playground. Allow at least three hours to see this museum. Although it's right downtown, it's located in a somewhat rundown area, so a taxi is recommended.