Palacio da Bolsa, UNESCO World Heritage Site, Porto (Oporto), Norte, Portugal, Europe

porto oporto portugal staircase architecture unesco historical site beauty interior design ornate elegant cultural heritage travel tourism historical architecture baroque craftsmanship stonework grand entrance lighting decorations iconic landmark sightseeing northern portugal building visit exploration structure heritage site culture elegance history interior architecture monumental tourist attraction impressive unique classical ambiance stairway grand staircase visitor experience architectural features historical significance palacio