View of three bridges over Douro River with tourist ships in front of Infante D. Henrique, Maria Pia and St. John bridges, Porto, Portugal, Europe

photography colour colour image color color image horizontal horizontal image outdoors outside day nobody no one no one travel travel destination travel destinations city cities douro river infante d henrique bridge maria pia bridge st john bridge porto portugal portuguese europe european building exterior building buildings architecture architectural modern urban scene urban scenes urban river water landmark landmarks famous well known well known bridge suspension bridge transport infrastructure diminishing perspective vanishing point perspective elevated view