JOHN HOWARD / SCIENCE PHOTO LIBRARY JOHN HOWARD / SCIENCE PHOTO LIBRARY
Water pipe. Ancient Roman water pipe encased in its original cement. More than 1500 years ago, the Romans built underground storm water sewers in the cities of their empire, some of which are still in service today. The Romans dumped refuse in the streets, meaning that much of it would have been carried into these sewers by the rainwater runoff. The Romans also had an extensive system of chann- els & aqueducts to supply their cities with water.
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