More places of interest: -- Select an option -- The fountains of Montjuic Olympic Barcelona Poble Espanyol Parc de la Ciutadella The streets and squares of Barcelona Gran Teatre del Liceu Teatre Nacional Auditori de Barcelona The Cathedral of Barcelona Santa Maria del Mar The church of the Mercé THE ROMAN AQUEDUCT The final archway of the city’s two aqueducts ( 1st. century ) is preserved inside the tower which defended the north-eastern side of the gate One of these has been externally rebuilt. The Gothic Quarter «      © Barcelona City Council