NOVA | Petra—Lost City of Stone Preview | PBS

Watch the full-length episode at http://video.pbs.org/video/2365427585/?Utm_source=youtube&utm_medium=pbsofficial&utm_campaign=nova_covefullprogram (US Only) How did early engineers carve tombs into rock cliffs and funnel water to this desert city?
Airing February 18, 2015 at 9 pm on PBS.