There's more than a few. But I would probably go to the Incas. You know, the Incas didn't last too long, a couple hundred years, three or four hundred years. But the Incas have the Andes mountains that are wrapped up right against their shoulder. I mean, Incas were in the Peruvian area, kind of that western edge of South America. And the Andes run kind of straight through that western side. So the problem is you have a lack of cultural diffusion.