Traditional Rabelo boat on Douro River with view to the Dom Luis I Bridge, 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 dom luis i bridge douro river porto portugal portuguese europe european urban scene urban scenes urban city cities building exterior building buildings architecture architectural history historical historic heritage townscape bridge metal arch arches arched landmark landmarks famous well known well known river water boat transportation transport 19th century rabelo