The earliest inhabitants of North America lived on vast, untouched terrain. Much of the land was covered with trees, and people made their homes in the dense forest. Native Americans who lived hundreds of years ago knew these woods very well, but still needed a way to mark the territory so their people knew which direction to go.
As it turns out, they actually solved this problem with a brilliant method that can still be seen today. You just have to know where to look!
Their solution was simply brilliant.