A centuries-old stone wall, stretching for miles; enormous
pictures scratched into the ground of a desert; rocks arranged in a
circle. You know what these landmarks are, right?
Guess again. Instead of the Great Wall of China or Stonehenge,
these are all ancient American ruins and landmarks. The United States is a
relative newcomer to the world stage, but there have been people long living on
this continent, and they've left traces of their presence just as mysterious
as those found in other countries.
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