 The old castle, today demolished, had an approximate rectangular plan, with towers on each vertice.Of the walls of the city, only the gate, tower of Santiago, tower of São Sebastião and Porta Nova remain (the latter being completely remodeled in a Rococo style and completely different stylistically).Its perimeter barely exceeded , and was delimited (today) in the east by the "Praça da República", west by the "Rua do Castelo" (keep and castle), "Rua de São Marcos", "Rua do Anjo", "Largo de Santiago", "Rua do Alcaide", "Largo de Paulo Orósio","Rua de Jerónimo Pimentel", "Campo das Carvalheiras", "Avenida de São Miguel o Anjo", "Largo da Porta Nova", "Rua dos Biscainhos","Praça do Conselheiro Torres e Almeida" and "Rua dos Capelistas" (walls).