Roman aqueduct
Rome's first aqueduct was built in 312 BC, and supplied a water fountain at the city's cattle market. By the 3rd century AD, the city had eleven aqueducts, sustaining a population of over a million in a water-extravagant economy; most of the water supplied the city's many public baths. Cities and towns throughout the Roman Empire emulated this model, and funded aqueducts as objects of public interest and civic pride, "an expensive yet necessary luxury to which all could, and did, aspire".
Varna
The main aqueduct of Odessos was recently discovered during rescue excavations north of the defensive wall. The aqueduct was built in three construction periods between the 4th and the 6th centuries; in the 4th century the aqueduct was built together with the city wall, then at the end of the 4th to early 5th centuries when a pipeline was laid inside the initial masonry aqueduct. Thirdly in the 6th century an extra pipeline was added parallel to the original west of it and entered the city through a reconstruction of the fortress wall.