The Roman aqueduct bridge in Termini Imerese is the largest and best preserved in Sicily. The source was located 5 km east of the city, at the foot of Monte San Calogero where the remains of the two settling tanks can still be seen in the locality of Brucato.
The aqueduct needed to cross the Barratina stream and the earliest the crossing was made at Fontana Superiore with a siphon about 600 m long, of which the well preserved hexagonal compression tower remains, 16 m high and resting on a square plinth of 6 m sides. On five of the sides were windows and from the east side the conduit started. On this tower was once a large inscription, now disappeared: aquae Cornealiae ductus p. XX. The last letters ('twenty feet') perhaps corresponds to the sides of the building.
Later it seems that the aqueduct passed further downstream: in Figurella a double-order bridge of arches is still visible (originally nine in the lower, fifteen in the upper: two arches for each order collapsed), 14 m high. The structure with facing blocks is the same as that of the amphitheatre and the curia and shows that it belongs to the same building project of the Augustan colony.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.