The Trevi Fountain (Italian: Fontana di Trevi) is a fountain in the Trevi district in Rome, Italy, designed by Italian architect Nicola Salvi and completed by Pietro Bracci. Standing 26.3 metres (86 ft) high and 49.15 metres (161.3 ft) wideit is the largest Baroque fountain in the city and one of the most famous fountains in the world. The fountain has appeared in several notable films, including Federico Fellini's La Dolce Vita.

The fountain at the junction of three roads (tre vie) marks the terminal point of the "modern" Acqua Vergine, the revived Aqua Virgo, one of the aqueducts that supplied water to ancient Rome. In 19 BC, supposedly with the help of a virgin, Roman technicians located a source of pure water some 13 km (8.1 mi) from the city. (This scene is presented on the present fountain's façade.) However, the eventual indirect route of the aqueduct made its length some 22 km (14 mi). This Aqua Virgo led the water into the Baths of Agrippa. It served Rome for more than 400 years

Legend holds that in 19 BC thirsty Roman soldiers were guided by a young girl to a source of pure water thirteen kilometers from the city of Rome. The discovery of the source led Augustus to commission the construction of a twenty-two kilometer aqueduct leading into the city, which was named Aqua Virgo, or Virgin Waters, in honor of the legendary young girl. The aqueduct served the hot Baths of Agrippa, and Rome, for over four hundred years.