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Forte de Sao Joao Rio de Janeiro RS0069.jpg
The Fortaleza de Sao Joao da Barra do Rio de Janeiro ( Fortress of Saint John of the Harbor of Rio de Janeiro ), popularly known as the Fortaleza de Sao Joao or Forte de Sao Joao ( Fort of Saint John) , a 16th-century star fort in Urca neighborhood of Rio de Janeiro, Brazil, erected by Estacio de Sa to protect Guanabara Bay from French invasion.