Pompeii ruins show that the Romans invented recycling

Excavations reveal that rubbish left outside the city walls wasn't just dumped. It was being collected, sorted and resold

They were expert engineers, way ahead of the curve on underfloor heating, aqueducts and the use of concrete as a building material. Now it turns out that the Romans were also masters at recycling their rubbish.

Researchers at Pompeii, the city buried under a thick carpet of volcanic ash when Vesuvius erupted in 79 AD, have found that huge mounds of refuse apparently dumped outside the city walls were in fact "staging grounds for cycles of use and reuse".