Across the lane from Capella de Santa Llúcia is the 16th-century Casa de l’Ardiaca (Archdeacon's House), which houses the city’s archives. Step into the supremely serene courtyard, cooled by trees and a fountain; it was renovated by Lluís Domènech i Montaner in 1902, when the building was owned by the lawyers’ college. Domènech i Montaner also designed the postal slot, which is adorned with swallows and a tortoise, said to represent the swiftness of truth and the plodding pace of justice.
You can get a good glimpse at some stout Roman wall in here. Upstairs, you can look down into the courtyard and across to La Catedral.