This street less than 1 meter wide, is located just where the exclusive Montacada Street, with its great palaces and its rich inhabitants starts.

On this area, there were several warehouses where the excess merchandise of the Santa Caterina Market and El Born Market was kept. Being so narrow, it was impossible to vent these warehouses and that resulted that the street was full of flies continuously.

But flies were not the only thing that hid in this street: The big carassa (in this case the famous "Papamoscas") give you some info about what happened here. It was the place of the busiest brothel in the city! There is even a Catalan saying that pays homage to this street: “al carrer de les mosques hi ha funció a les fosques”, that in English would be something like this: “in the street of the flies there is a function at night”