The National Congress is one of the world's most iconic parliament buildings, a masterpiece by architect Oscar Niemeyer. The building features twin 28-story towers rising from a horizontal platform, with two contrasting domes on either side: a convex dome for the Senate and a concave bowl for the Chamber of Deputies, symbolizing gathering and distribution respectively. The reflecting pools and vast Esplanade of Ministries create a powerful monumental setting. Free guided tours take visitors through the impressive chambers, explaining Brazil's legislative process. The building is particularly stunning when illuminated at night. As the heart of Brazilian democracy, it represents Niemeyer's vision of modernist architecture serving civic purpose.