Three of the original Roman aqueducts are still standing, as of 2015: the Arch of Drusus, Porta Maggiore and Nero's Aqueduct. The other eight aqueducts were destroyed by Germanic invaders.
One of the remaining aqueducts, Porta Maggiore, is a double-arched construction built to carry water from the valley of Anio and over the Via Praenestina and Via Labicana roads to Rome. The 42-mile journey provided the majority of the city with its water supply. The Arch of Drusus, or Aqua Antoniniana, runs 56 miles to the Baths of Caracalla on the Appian Way, an ancient Roman road in Rome, providing the baths with 6.7 cubic feet of water each day. The baths were named after Emperor Caracalla, who lived in the second century A.D. Although the majority of the aqueduct no longer stands, people can still view the arch.
Nero's Aqueduct, or the Arcus Neroniani, was constructed under the direction of Nero, the emperor of Italy during the first century A.D. The aqueduct connected Claudius' Aqueduct to the Domus Aurea, the emperor's palace. The ruins can be seen at the Via Statilia road and run from Porta Maggiore and Palatine Hill.
The ancient Romans started building aqueducts in 321 B.C. and continued until 226 A.D. The Romans built hundreds of aqueducts, though very few remain.