Yonge Street, Toronto

Not only does this street designate Toronto's east-west split, it is also the city's longest thoroughfare. In fact, Yonge is known as the world's longest street, stretching from Lake Ontario to the town of Rainy River, more than 1900 kilometers away. Originally used as a trail by the Hurons, the road became an official passage in the 1790s. Today, it is a burgeoning commercial district and a beehive of activity, especially in the section between Front and Lawrence. One of Toronto's three subway lines operates along this route.