aerial view of porto by douro river, portugal

across aerial and architecture attraction bridge building city cityscape destination district douro downtown duruelo dusk europe european famous flowing from heritage hill historic historical history house iberian its landmark landscape major near northerncentral old one oporto outlet panorama peninsula porto portugal portuguese province residential river riverbank rivers riverside scene scenery scenic sierra sightseeing skyline soria source spain street sunset tour tourism tourist tower town travel trip urban view village water