Cais das Colunas landmark located by Commerce square in Baixa district, Lisbon

cais das colunas landmark commerce square baixa district lisbon emblematic pillars marble staircase viewpoint tagus river relaxing sight scenic walk riverfront terreiro do paco eugenio dos santos praca do comercio columns stone stairway iconic portugal horizon steps estuary view pombaline downtown chillout lisboa estremadura representation tejo river clouds