A route exploring the perimeter of the Roman wall reveals the ancient remains in places such as the Plaça Ramón Berenguer, Carrer Tapineria and the Plaça Nova. The latter is the former site of one of Barcelona's gates. Two towers from the wall bear witness to the fact that carriages and pedestrians once entered the city through here. On one side, adjoining the Casa de l'Ardiaca, or Archdeacon's House, is a section of a modern replica of one of the city's aqueducts. This marked the beginning of one of the main roads in the Roman colony, the former Cardus, today Carrer del Bisbe, which was bisected by the Decumanus a few metres ahead, now Baixada de la Llibreteria.