The centre of Paris was a warren of narrow streets up until the 1870s when Baron Haussmann directed the construction of wide boulevards cutting straight through it. Paris was greatly changed. There are, however; many areas where you can get a feel for what it must have been like - without the horses I guess. I did this from a photo, starting with a pencil under-drawing followed by a fibre-tip with a fairly broad nib to vary the line thickness.