Detail of balconies and windows in Ribeira Distric, Porto, Portugal

porto ribeira street unesco lowangle architectural charm historic district cityscape portuguese city street view urban scene lowangle perspective unescolisted area historical district portos heritage riverside culture traditional architecture unesco recognition authentic neighborhood portuguese heritage historic buildings urban history ribeiras charm lowangle streets historic facades cultural heritage architectural perspective historical streets ribeiras allure lowangle architecture porto and unesco authentic streets historic preservation architectural uniqueness unesco heritage architectural elements historical character portos streetscape historical authenticity atmosphere below charm scene details streets authentic