A testament to Emperor Hadrian’s deep admiration for Athens and Greek culture, the aqueduct was designed to supply the city with fresh water for centuries. Stretching approximately 15 miles (25 km), it runs mostly underground, and was used to channel water to public baths and reservoirs intermittently from Roman rule to the 19th century. One of its most visible remnants today lies beneath Dexameni Square in Kolonaki — a name that literally means “reservoir.” Though no longer in active use, the aqueduct remains structurally intact and functional.