 The River Seine, winding through the ancient heart of Paris, under all of those pretty bridges, is one of the most beautiful sights in one of the most beautiful cities in the world. But public confidence about it being clean enough to swim in for the Summer Olympics is low. Would you swim in this water? No. Why not? No way. Because just look at the colour of it. I would not swim in it. Yeah, it smells really bad, so I would definitely not go into it.