A massive spiral appears on the floor of a seven-sided temple in this city whose apex includes the largest pure crystal stone in the world. The facade of a building in this city features asymmetrical concrete basins that send waterfalls into a reflecting pool. 16 hyperboloid curves (10[1])separate thousands of painted tiles in this city’s main cathedral. Residents of this city settled in wooden houses while waiting for the construction of equitable housing blocks inspired by those in Le Corbusier’s Radiant City. Roberto Marx designed the landscapes outside a Congress building in this city with two half hemispheres on its roof. Starting in the 1950s, this city was planned around the shape of an airplane by Lúcio Costa. Oscar Niemeyer designed numerous civic buildings in, for 10 points, what planned capital of Brazil? ■END■