Here is one similar. Not the exact one I was looking for.

http://www.sciencedaily.com/releases/2005/04/050423191506.htm

They are still teaching that the Vikings even pre-dates Columbus. Why would it be a stretch any other people did also?

There are Pyramids in China, up and down the Mississippi, Brazil, etc..

I see your point though. But people didn't just stay in one part of the world. Some were a nomadic people and shared their belifes and values freely. Some were a war-mongering, conquering people, that came, destroyed, and took. A honest study of History gives you alot of the answers.