Dom Luís I Bridge, Multi-level iron arch bridge in Porto's historic center, Portugal.
Dom Luís I Bridge is a two-level iron structure with two traffic levels that crosses the Douro River. The structure measures over 385 meters long and its main arch spans approximately 172 meters across the water.
The bridge was built between 1881 and 1886 and replaced an earlier suspension bridge at the same location. Belgian engineer Théophile Seyrig, who worked with Gustave Eiffel, designed this revolutionary structure.
The bridge links two districts and forms part of Porto's UNESCO World Heritage site recognized since 1996. It shapes the city's visual identity and demonstrates Portugal's industrial strength during the 19th century.
The upper deck is used by metro trains while the lower level carries cars, pedestrians, and cyclists. Visitors can view the city and river from either level depending on which route they choose.
The structure was named after King Dom Luís I and received Cultural Heritage status in 1982. The nighttime lighting casts reflections on the water and makes the structure particularly visible after dark.
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