The epicenter of Rio’s Carnaval, the Sambódromo was designed by Oscar Niemeyer and completed in 1984. During the big parades, come for the fantastic views from the stands across elaborate floats, whirling dancers and pounding drum corps. The open-air arena received a makeover for the 2016 Olympics, with improved sight lines and a more symmetrical design in keeping with Niemeyer’s original vision.