Dom Luis I Steel Bridge Overlooking the Douro River in Porto, Portugal

Spanning the Douro River between Porto and Vila Nova de Gaia, this iconic blue steel arch bridge is one of the most photographed landmarks along the riverbanks. Its impressive structure supports both vehicular traffic above and pedestrian walkways below, offering panoramic views over the historic cityscape dotted with terracotta rooftops and colorful facades. Alongside flows an old Rabelo boat, traditionally used for transporting Port wine, further accentuating the cultural heritage of the region.