Look at recommendations for things to do in Porto and watching sunset from the Dom Luis I Bridge over the Douro River is on most lists. So that's just what we did. The upper level of the bridge gives you a fantastic view of the city. The only catch is that the local trains use the bridge and sunset-watchers have to move to the narrow sidewalks when the trains pass. Luckily, the trains give a whistle warning as they approach.

Hundreds of people gathered to watch sunset. There were hugs, toasts and selfies all around.