The ruins consist of an amphitheatre (now almost entirely demolished, but better preserved in the 18th century), a theatre, and a very fine aqueduct in opus reticulatum, the quoins of which are of various colours arranged in patterns to produce a decorative effect.
From Toulouse to Agen the main canal follows the right bank of the Garonne, crossing the Tarn on an aqueduct at Moissac, while another magnificent aqueduct of twenty-three arches carries it at Agen from the right to the left bank of the river.
East of Valle di Maddaloni, the Ponte della Valle, an aqueduct built by the orders of Charles III.
Trajan, however, built an aqueduct nearly 20 miles long, which was restored by Theodoric in 503.
To Madame de Maintenon, by whom additions were made; the aqueduct (17th century) in the park was designed to carry the water of the Eure to Versailles, but was not completed.
The public watersupply is brought into the city over a fine old aqueduct (3 m.
To-day these have all vanished, with the exception of one aqueduct which still conveys the water of the Tigris to the shrine of Abd al-Qadir (ul-Kadir).
The remains of a fine aqueduct that once brought water from the Kiakhta Chai, which begins some 6 m.
South-east of the city, along the valley of the Wadi Melain, are hundreds of large stone arches, magnificent remains of the Roman aqueduct from Zaghwan to Carthage.
Remains of a Roman theatre, of an amphitheatre, of an aqueduct which entered the town by the Porte Taillee, gate cut in the rock below the citadel, and an arch of a former Roman bridge, forming part of the modern bridge, are also be seen.