Oleander blooming at the Forum in the Sant Martí district

At the time of Caesar Augustus, Barcino had the form of a castrum, with the usual central forum and perpendicular main streets: the Cardus Maximus (Carrer de la Llibreteria) and the Decumanus Maximus (Carrer del Bisbe) intersecting at the top (25 m) of the Táber hill (Mons Táber), site of the Iberian Barkeno; the perimeter walls were 1.5 km long, enclosing an area of 12 ha.