Having worked there for almost a year, I had the chance to visit the Brazilian Congress from inside out, specially the backstage of the legislative and political daily activities, where more lively debates take place.
There is a guided tour which walks you through the premises, with knowledgeable guides, able to deep dive your experience into the historical aspects of this great piece of the well known creative Brazilian architecture Oscar Niemeyer.
It's worth a visit if you are in Brasilia for a while. The building is at the end of the major axe that characterizes the central urban plan and it's surrounded by the Supreme Court, the line up of the ministerial buildings and the Presidential Palace.