Traditional Rabelo boat on Douro River, Porto, Portugal, Europe

photography colour colour image color color image horizontal horizontal image outdoors outside day background people incidental people people in the background travel travel destination travel destinations old town waterfront tradition traditional ribeira neighborhood unesco unesco world heritage site world heritage site porto portugal portuguese europe european urban scene urban scenes urban city cities building exterior building buildings architecture architectural history historical historic heritage high angle view high angle view over townscape cityscape rabelo boat transportation transport douro river river water diminishing perspective vanishing point perspective