Distinctive marker on Rua das Aldas Street in Porto, adjacent to a yellow facade

sign rua das aldas porto yellow facade distinctive marker street indicator landmark tourism san lorenzo dos riglos navigation wayfinding visual guide iconic location cityscape historical charm cultural exploration travel neighborhood discovery unique sign historic streets portos character local discovery notable location navigational aid historical significance street symbols exploration city identifiers cultural context landmark indication emblem prominent signage representation recognition streetscape route identification route discovery distinctive urban element facade signage pathway identification identification urban context pathway marker urban icon identity portugal blue sky window in yellow facade alleys