Rua Goncalo de Carvalho: Most Beautiful Street in the World By Kaushik Monday, March 11, 2013 South America, Travel 6 comments Rua Goncalo de Carvalho is a street located in Porto Alegre, the capital and largest city in the Brazilian state of Rio Grande do Sul. Flanked by trees on either side, the street became internationally known after a campaign for its preservation spread..