Brasília is a planned capital, so its must-see list favors the monumental core over scattered sights. Praça dos Três Poderes anchors the city, flanked by the Palácio do Planalto and the striking Congresso Nacional, whose twin towers and paired domes symbolize the branches of Brazilian government. Nearby, the Catedral Metropolitana de Brasília stuns with its crown of curved concrete columns and stained glass, while the Eixo Monumental ties these landmarks together on foot or by bike. Because the city was built around Oscar Niemeyer's modernist vision, prioritizing this compact axis lets visitors grasp Brasília's architecture and political symbolism in a single, efficient day.