Fodor's Expert Review Museu Nacional
A little off Rio's main tourist track, the National Museum is well worth the metro ride to view its exhibits of botanical, anthropological, and animal specimens. With a permanent collection of 20 million objects (give or take a few), the supply is nearly endless. Temporary exhibitions focus on subjects such as meteorites, tribal art, and animal evolution. The opulent museum building—a former imperial palace—itself merits a visit, and the vast grounds are home to Rio's city zoo.