A line exits in every city – it may be a street, train tracks, the river or the sidewalk – that separates the rich from the poor, the strong from the weak, the haves from the have-nots. These people are known by their needs, but what if they were known by name? In this docu-reality series, "Serve the City," college students and young professionals take a week off to travel to cities around the world to say, “It’s time to cross the line.”