NARRATOR: High in the Peruvian Andes, there's an ancient city called Machu Picchu. It is a ruin that defies explanation. Who were the mysterious people who built it and why did they build it here?

In recent years, Peru has engaged in a grass-roots effort to elevate Huchuy Qosqo, Waqrapukara and other archaeological sites that are just as well preserved or culturally significant as Machu Picchu ...