The Palacio do Planalto is one of the more difficult important buildings to visit in Brasilia, as tours are only available on Sundays, and you must request an English tour in advance. If you are in town on Sunday, above all, do it! During my visit the tour consisted of about 30 Portuguese-speaking visitors, while I had my own private tour guide assigned to me to translate in English. Deborah did a wonderful job providing all the details, and the building is well worth the visit. Plus, as with all the major buildings in Brasilia, the tour is free!