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.

Imagine unfolding a map that doesn’t just show you where to go—but why it matters. This map is stitched together not by algorithms or travel influencers, but by the people who live, breathe, and love ...

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 ...