A boat cruises on the River Douro, past the Ribeira District, UNESCO World Heritage Site, Porto, Douro, Portugal, Europe

outdoors outside day colour image colour color image color horizontal photography douro porto portugal portuguese europe european travel no people nobody no one no one travel destination travel destinations travel destination water town boat transportation transport river river douro high angle view high angle elevated view from above looking down boat tradition traditional typically stereotypical traditional tradition traditionally stereotypically typical culture stereotypical culture culture cultures cultural old fashioned rabelo industry viniculture wine industry transportation transport the past history historical historic heritage cultural culture attraction cruise boat cruise ribeira district unesco world heritage site unesco world heritage sites unesco world heritage site world heritage sites