detailed view at the granite pillar with sphere on top, d. luis bridge structure and blue sky as background

10022018 animal antique architecture background ball beams bird blue bolt bridge center colored colors connections detailed douro downtown engineering geometry granite iron luis metal metallic ornamented outdoor perspective pillar pillars place porto portoportugal portugal ribband river rivets rustic screws seagull shadows sky sphere stone structural structure sunlight top touristic travel urban view wrought