silhouette of man's legs taking a step to cross the porto metro track on the dom luis bridge.

morning blue sky sunrise urban sunset bridge douro river frozen moment moments life walking man step crossing silhouette legs reflection texture dom luis twilight suspension people railway trespassing railways dangerous activity rail tracks trespass line road street railroad metro porto public transportation sightseeing travel memorable views historical bridges iconic structures tourist attractions tram sites unesco world heritage ponte oporto portuguese 39aph39 taking cross track cables arches leg train