Pont Luis I Bridge over the Rio Duoro, Porto

The magnificent iron bridge over the River Duoro in Porto, Portugal, named after Luis I and constructed in 1886, is an impressive sight. It's a steel bridge with two levels - a road on the bottom and a railroad track above. The bridge is a beautiful example of 19th-century engineering.

I had the chance to photograph it on a day trip to Porto, but it's on my list of places to revisit, as it would be better to re-photograph the Luiz I Bridge early in the morning or just before sunset when the light is at its most dramatic. Taking pictures at dusk guarantees a great picture, with traffic in the foreground leaving light trails. You might even have movement on the river, with boats passing or clouds passing in the sky.

Today I decided to take this in colour and then post-process it in CaptureOne, but I'd like to try this in black and white to create a moodier picture. Also, this would be great after a rainstorm, especially if the sky is dark, like in Ernst Haas's image of Route 66 .

No matter what time of day you choose to visit, make sure you take your time to capture this magnificent structure in all its glory.