North America is the third largest continent in the world. It is located in the Northern Hemisphere. The north of the continent is within the Arctic Circle and the Tropic of Cancer passes through ...

This story appears in the November 2013 issue of National Geographic magazine ... and William Clark on their epic journey across North America. The other one is just beginning.

Across a series of maps, it highlights who spends the most on travel and how America’s varied geography influences ... such as northwestern North Dakota and northwestern Wyoming.