Ancient technology ...
On a similar vein - and just as impressive - was the discovery in London, of a machine to provide water to Roman London (I think it was discovered by the Crossrail team).
It was a series of buckets, on an iron chain, driven (presumably) by donkey power.
Completely and utterly unknown anywhere else in the Roman world, which is why they struggled (with modern technology) to recreate a working model.
Anyone know of Trajans bridge ? Parts of which still stand.
It annoysme when people assume that our ancestors were somehow less clever than us. They weren't. As James Burke so eloquently put it "They just knew different things."