Oscar Niemeyer's 1970 hyperboloid concrete-rib cathedral — Brasília's spiritual centre.
From Wikipedia
The Cathedral of Brasília is the Roman Catholic cathedral serving Brasília, Brazil, and serves as the seat of the Archdiocese of Brasília. It was designed by Brazilian architect Oscar Niemeyer and engineered by Brazilian structural engineer Joaquim Cardozo, and was completed and dedicated on May 31, 1970.