To add a little detail, we actually stumbled upon the Roman ruins as we were not looking for it. There is no street to the right as it is a courtyard walkway lined with shops. What we were looking for, and highly recommend, is the restaurant ironically called "Living Barcelona". If you were on the right walkway shown in the picture looking across the ruins, you would be looking straight at the restaurant. It is not like is out of the way, as it is only one block off the north side on La Rambla - the mile long pedestrian shopping/entertainment/lodging area overcrowded with tourist and inflated prices. But that market along La Rambla is phenomenal and great for street photography.