An ancient sanctuary on a Greek island yields clues to one of the region's first urban centers.

An ancient sanctuary on a Greek island yields clues to one of the region's first urban centers. ➡ Subscribe: http://bit.ly/NatGeoSubscribe About National Geographic: National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible.