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Photo: Rosa Menkman, CC BY 2.0 via Wikimedia Commons
A rather bizarre, modern cathedral shaped like a volcano, with a very impressively vacuous interior.
The Metropolitan Cathedral of Saint Sebastian, better known as the Metropolitan Cathedral of Rio de Janeiro or as the Cathedral of St. Sebastian of Rio de Janeiro, is a cathedral of the Catholic Church and the seat of the Archdiocese of Rio de Janeiro. The cathedral is home to the cathedra of the Archbishops of the city of Rio de Janeiro, Brazil. The church is dedicated to Saint Sebastian, the patron saint of Rio de Janeiro.
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The headquarters for the federal gas (petrol) company is an interesting piece of brutalist architecture which somehow resembles a Rubik's Cube with some blocks missing.
Arcos da Lapa, Carioca Aqueduct
Colonial structure built in 1750 that brought water from springs to downtown.
Escola de Música da Universidade Federal do Rio de Janeiro
A good place to catch free classical music concerts. Stop by during the day for a schedule or check the newspaper for events, as the surrounding neighborhood can be a bit shady at night.
Camara Municipal do Rio de Janeiro
Hosts the city council.