We asked Aicher, author of "Guide to the Aqueducts of Ancient Rome," about the Romans' sophisticated water distribution system, including its elegant aqueducts. Here's what he told us: NOVA ...

Aqueducts are one of the wonders of the Roman Empire. These graceful structures are not only majestic, but are engineering marvels that survive to this day. In "Construct an Aqueduct," you are ...