The Dom Luís I Bridge is a double-deck metal arch bridge spanning the Douro River between Porto and Vila Nova de Gaia, Portugal, completed in 1886. Visitors can cross the upper deck on foot or via the Porto Metro line D, while the lower deck accommodates buses, taxis, and pedestrians, connecting to the Porto waterfront's Praça da Ribeira and Gaia's Port wine lodges. At its construction, the bridge's 172-metre span was the longest of its type in the world and remains a UNESCO World Heritage Site and Portuguese National Monument.
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