Structural engineer Steve Burrows scans the sacred Inca city of Machu Picchu using 3D laser technology. His three main questions: How did the Inca build a city atop a mountain? How were the terraces constructed? And how did they supply water to the city?
| Actor | Role |
|---|---|
 Dallas CampbellSelf | Self |
| SSteve BurrowsSelf | Self |