The Dom Luis bridge erected in 1886. The architect was Teóphile Seyrig under the supervion of Gustaf Eiffel.
A story behind: Since cold air is denser than the warm air, it sinks to the lowest point of the ground which is usually the valley of the river. There is a sufficient moisture in the air from the water ( the water temperature is always higher than the air ) and the fog begins to form in layers as the air temperature approaches the dew point. The fog develops over night and it usually persists until sun rises.
Early cold morning on the Dom Luis bridge.
Gear: Nikon D700. Nikkor 16-35 mm. Handheld.
Shutter speed: 1/30 sec
Exposure bias: 0 EV
Focal Length: 35 mm
Place taken: Porto, Portugal.Date taken: Thursday, November 27th 2012, 08:34