http://www.newsweek.com/genetic-analysis-suggests-twin-legends-inca-origins-are-correct-950176

The Incan Empire ended shortly after Europeans arrived in 1531, but even when the empire fell, some of its aristocrats likely survived. Hundreds of years later, their descendents—and their genes—live on in the Andes Mountains, as do stories about where precisely those nobles came from in the first place.

Two such stories exist, one linking the nobles to Lake Titicaca and the other to a mountain called Pacaritambo. And it turns out that the genes they've left behind can help confirm those stories, according to an ongoing genetic analysis of people believed to be descended from Inca nobles.