This view of Porto has been well photographed as it lies directly below the Cathedral in the heart of the old city. As such it is one of the oldest streets in Porto and exudes character. By character I mean it was, certainly historically, one of the dodgiest streets in the city! These days it has been pretty much absorbed into the Porto tourist trail.
The name Rua Escura translates to "Dark Street", the explanation for which is fairly evident from the photo. It sits in the shadow of the Cathedral, and apparently in days gone by there was another large building to the other side of the street, all but blocking out the remaining light.