One of Brasilia's best-known images is the shot of the two towers on the Planalto Central, flanked by the two "bowls," one faceup and one facedown. It is quite beautiful in an abstract way. The inside is open for English-language tours (including a visit to the Chamber of Deputies), though it's really only of moderate interest to non-Brazilians. No shorts or tank tops allowed. If you don't take the tour, you're only allowed in the museum and the lobby.