The iconic Luís I Bridge in Porto, Portugal, is a stunning double-deck metal arch bridge offering panoramic views of the city's Ribeira district and Vila Nova de Gaia. Pedestrian access is free and available on both levels, year-round, 24/7, though weather conditions might impact enjoyment. While easily explored solo, it's often a highlight of guided city tours. A typical visit to walk across and enjoy the views might last 30-60 minutes. Accessibility is generally good, but reaching the upper deck might involve stairs or a funicular from riverside for those with mobility concerns. There are no seasonal restrictions, and walking across the bridge is entirely free, making it an essential and budget-friendly experience for any visitor to Porto.