1. The Dom Luis Bridge is an iconic landmark in Porto, Portugal, spanning the Douro River and connecting the historic Ribeira district with Vila Nova de Gaia. It was designed by Théophile Seyrig, a student of Gustave Eiffel, and completed in 1886. The bridge is made of wrought iron and has two levels, with the top level offering stunning views of the city. It is also used by the city’s metro system. Interestingly, the bridge was originally intended to be a toll bridge, but the tolls were abolished a few years after its construction due to public protests.

2. The bridge does not have set working hours as it is a public pedestrian and transportation crossing. However, the metro operates from 6 am to 1 am and the bridge is accessible at all times.

3. There is no ticket required to access the bridge. Metro tickets can be purchased at any station or via the Andante app. The bridge is also accessible by foot or car.