View of Monastery of Saint Augustine of Serra do Pilar and Dom Luis Bridge over the Douro River in the evening, Porto, Portugal, Europe

photography colour colour image color color image horizontal horizontal image outdoors outside sunset nobody no one no one travel travel destination travel destinations city cities douro river dom luis i bridge waterfront porto portugal portuguese europe european building exterior building buildings architecture architectural urban scene urban scenes urban river water landmark landmarks famous well known well known bridge elevated view high angle view high angle cityscape arch arches arched metal bridge history historical historic heritage 19th century monastery of saint augustine of serra do pilar monastery of serra do pilar monastery monasteries religious building roman catholic 17th century