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It is one of the most impressive bridges and best preserved Roman aqueducts and had to pass the trench of Acquarainga, in a deep gorge. The central arch was 30 meters high and the overall construction length was 120 meters. The Anio Novus aqueduct was built between 38 and 52 AD at the time of Emperor Claudius. During the fourth and fifth centuries the bridge was subject to consolidation (reinforcement) and the light (length) of the arches was reduced. The bridge is still walkable and owes its name to an image of Sant’ Antonio put there in the seventeenth century.