There was once a man named Altair who was forced to walk down every road.
He was cursed as a boy to do so, and while the curse granted him immortality, it also compelled his compliance.
When he arrived at dead ends, or found himself in dark alleys ending with brick walls, he would simply turn right around and continue walking. He was always drawn towards the roads that he had yet to travel on.
His immortal feet never tired, neither did they become sore, but after many years his heart did. He stayed so briefly in each new place that he never bothered to remember the faces of the townsfolk, but he did memorize the names of every street and l